TECHNICAL SPECIFICATION FOR THE DELIVERY OF

TELEVISION PROGRAMMES AS AS-11 FILES

This document outlines the technical requirements for the delivery of programmes using the AS-11 UK DPP file

format, as agreed by the Digital Production Partnership Broadcasters:

BBC, BT Sport, Channel 4, Channel 5, ITV, Sky, STV and TG4

The document includes the technical parameters that all Ultra-High Definition (UHD), High Definition (HD) and

Standard Definition (SD) file delivered programmes must meet to be acceptable by the DPP broadcasters. It is

set out as follows:

•

Part 1

Picture and sound quality and QC requirements;

•

Part 2

Additional technical requirements for

File

programme delivery;

•

Part 3

Broadcaster specific requirements that are unique to the

Channel 4

Channel 4 Important Notes:

This document contains a detailed specification for delivering UHD material. Channel 4 is currently unable to

accept UHD material, therefore please ignore the UHD related requirements.

For Commissions contracted from the 1st of October 2017, Channel 4 no longer accepts tape delivery.

Every programme submitted for transmission must satisfy a Quality Control process specified by Channel 4.

Any programme failing the QC process will be rejected and returned to the supplier for repair.

Please ensure you are using the current version of this document, available at the Channel 4 Programme

Management portal,

“Technical Specification for File Delivery (DPP/Channel Four Television)”

http://www.channel4.com/info/commissioning/production-information/programme-management

Please read carefully the Channel 4 specific requirements in Part 3 (section 6) which contains mandatory

information for delivering of content to Channel 4.

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Contents

PART 1 – GENERAL REQUIREMENTS 4

1. Video Technical Requirements ................................................................................................................. 5

1.1. Video Formats ........................................................................................................................................................ 5

1.1.1. Ultra-High Definition ............................................................................................................................................ 5

1.1.2. High Definition ..................................................................................................................................................... 5

1.1.3. Standard Definition .............................................................................................................................................. 5

1.2. Signal Parameters ................................................................................................................................................. 6

1.2.1. Video Level Tolerance ......................................................................................................................................... 6

1.2.2. High Dynamic Range .......................................................................................................................................... 6

1.2.3. Blanking .............................................................................................................................................................. 7

1.2.4. Field Dominance ................................................................................................................................................. 7

1.3. Video Line-Up ......................................................................................................................................................... 7

1.3.1. ITU-R BT.2100 UHD Programmes ...................................................................................................................... 7

1.3.2. SMPTE ST2036-1 UHD, HD and SD Programmes ............................................................................................. 7

1.4. Origination .............................................................................................................................................................. 7

1.4.1. DSLR Cameras ................................................................................................................................................... 8

1.4.2. Drones and Remotely Operated Cameras .......................................................................................................... 8

1.5. Film for HD and UHD Acquisition ......................................................................................................................... 8

1.6. Post Production ..................................................................................................................................................... 8

1.6.1. Video Codecs used for Post Production .............................................................................................................. 8

1.6.2. Film Motion or ‘Film Effect’ .................................................................................................................................. 9

1.6.3. Frame Rate Conversion ...................................................................................................................................... 9

1.6.4. Up Conversion to UHD ........................................................................................................................................ 9

1.7. Picture Aspect Ratio .............................................................................................................................................. 9

1.7.1. ‘Cinemascope Ratios’ as Letterbox ..................................................................................................................... 9

1.7.2. Floating Images ................................................................................................................................................. 10

1.7.3. ‘Pillar-Boxed’ HD Material.................................................................................................................................. 10

1.8. Archive Material ................................................................................................................................................... 10

1.8.1. General Quality ................................................................................................................................................. 10

1.8.2. Up-Converted SD Material ................................................................................................................................ 10

1.8.3. Picture Aspect Ratio .......................................................................................................................................... 10

1.8.4. Safe Areas......................................................................................................................................................... 11

1.9. Use of Lower Resolution Images ....................................................................................................................... 11

1.9.1. Non-UHD Material ............................................................................................................................................. 11

1.9.2. Non-HD Material ................................................................................................................................................ 11

1.10. 3D .......................................................................................................................................................................... 11

1.11. Safe Areas for On-Screen Text ........................................................................................................................... 11

1.11.1. Text Size ........................................................................................................................................................... 12

1.11.2. In Vision Captions for Foreign Language Assets............................................................................................... 12

1.11.3. Safe Areas for SD On Screen Text ................................................................................................................... 12

1.11.4. Safe Areas for HD On Screen Text ................................................................................................................... 13

1.11.5. Safe Areas for UHD On Screen Text ................................................................................................................. 14

2. Audio Technical Requirements ............................................................................................................... 15

2.1. Dialogue ................................................................................................................................................................ 15

2.2. Loudness .............................................................................................................................................................. 15

2.2.1. Loudness terms ................................................................................................................................................. 15

2.2.2. Guidelines for True Peak Audio Levels ............................................................................................................. 16

2.3. Metering Requirements ....................................................................................................................................... 16

2.4. Stereo Audio Requirements ................................................................................................................................ 16

2.4.1. Stereo Line-Up Tones ....................................................................................................................................... 16

2.4.2. Stereo Phase..................................................................................................................................................... 16

2.5. Surround Sound Requirements .......................................................................................................................... 16

2.5.1. Surround Line-Up Tones UHD Programmes ..................................................................................................... 16

2.5.2. Surround Line-Up Tones HD Programmes........................................................................................................ 17

2.5.3. AES Sample Timing .......................................................................................................................................... 17

2.6. Surround Sound Mixing Requirements ............................................................................................................. 17

2.6.1. Dialogue in a Surround Mix ............................................................................................................................... 17

2.6.2. General Mixing Requirements ........................................................................................................................... 17

2.6.3. Stereo and Centre Channel Monitoring ............................................................................................................. 18

2.6.4. Consistency of Image ........................................................................................................................................ 18

2.7. Dolby Metadata Settings ..................................................................................................................................... 18

2.7.1. Guidance for Acquired Programmes and Movies .............................................................................................. 19

2.8. Sound to Vision Synchronisation....................................................................................................................... 19

2.8.1. Audio / Video Sync Markers .............................................................................................................................. 19

3. Quality Control (QC) ................................................................................................................................. 20

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3.1. General Quality .................................................................................................................................................... 20

3.1.1. General Video Quality ....................................................................................................................................... 20

3.1.2. General Audio Quality ....................................................................................................................................... 20

3.1.3. UHD Programmes ............................................................................................................................................. 20

3.2. Photosensitive Epilepsy (PSE) ........................................................................................................................... 21

3.2.1. PSE testing........................................................................................................................................................ 21

3.2.2. PSE – broadcast warnings ................................................................................................................................ 21

3.2.3. UHD Programmes ............................................................................................................................................. 21

3.3. Automated Quality Control (AQC) ...................................................................................................................... 22

3.4. Eyeball Quality Control ....................................................................................................................................... 22

3.5. File Compliance (File delivery only) ................................................................................................................... 22

PART 2 – FILE DELIVERED PROGRAMMES 23

4. Programme Format ................................................................................................................................... 23

4.1. Programme Layout for File Delivery .................................................................................................................. 23

4.2. Programme Parting.............................................................................................................................................. 23

4.2.1. Single Part or Soft Parted Programme .............................................................................................................. 23

4.2.2. Hard-Parted Programme ................................................................................................................................... 24

4.3. Multi-Part Programme Delivered on Multiple Files ........................................................................................... 24

4.4. Start and End ....................................................................................................................................................... 24

4.5. The Ident Clock or Slate ...................................................................................................................................... 24

4.6. Audio Channel Allocations HD and SD .............................................................................................................. 25

4.7. Audio Channel Allocations AS-11 DPP X1 ........................................................................................................ 26

4.8. Audio Only Files .................................................................................................................................................. 26

4.9. Closed Captions (Subtitles) ................................................................................................................................ 26

5. File Requirements ..................................................................................................................................... 26

5.1. UHD Files .............................................................................................................................................................. 27

5.1.1. UHD Video Codec ............................................................................................................................................. 27

5.1.2. UHD High Dynamic Range ................................................................................................................................ 27

5.1.3. UHD Audio ........................................................................................................................................................ 27

5.1.4. UHD Additional Requirements........................................................................................................................... 27

5.2. HD Files ................................................................................................................................................................ 27

5.2.1. HD Video Codec ................................................................................................................................................ 27

5.2.2. HD Audio ........................................................................................................................................................... 27

5.3. SD Files (Legacy programmes only) .................................................................................................................. 27

5.3.1. SD Video Codec ................................................................................................................................................ 28

5.3.2. SD Audio ........................................................................................................................................................... 28

5.4. Timecode .............................................................................................................................................................. 28

5.5. Metadata ............................................................................................................................................................... 28

5.5.1. Delivery Requirements in MXF .......................................................................................................................... 28

5.5.2. Metadata Completion ........................................................................................................................................ 28

PART 3 – CHANNEL 4 FILE DELIVERY 29

6. Channel 4 File Requirements .................................................................................................................. 29

6.1. Technical Responsibility and Contacts: ............................................................................................................ 29

6.2. File Naming Requirements - PROGRAMMES .................................................................................................... 29

6.3. File Naming Requirements – QC reports ........................................................................................................... 29

6.4. Channel 4 File Delivery Detail ............................................................................................................................. 30

6.5. Surround Audio Requirements ........................................................................................................................... 30

6.6. Programme Layout Requirements ..................................................................................................................... 30

APPENDIX A – VERSION CONTROL 32

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Part 1 – General Requirements

Technical Requirements

This part of the document details the technical and quality requirements that every programme must comply

with. It also forms a binding obligation on the producers of programmes delivered to the DPP member

broadcasters.

Assessment of quality is highly subjective, and therefore dependent on the nature of the programme. Some of

the quality requirements are expressed in relative terms (“reasonable”, “not excessive” etc.), and it will be

necessary to make a judgement as to whether the quality expectations of the intended audience will be fulfilled,

and whether the broadcaster will feel that value for money has been achieved.

Photosensitive Epilepsy and Quality Control

Every

programme submitted for transmission must satisfy the Ofcom Photosensitive Epilepsy guidelines,

which are detailed in the

QC section

of this document. Any programme failing to meet these requirements, or

any of the other QC requirements, may be rejected and returned to the supplier for repair.

Please be aware that the Producer of the programme as well as the Broadcaster may be liable for

any action taken by Ofcom or a member of the public, for a breach of the Photosensitive Epilepsy

requirements.

Equalities Act 2010

The Equalities Act 2010

(formerly the Disability Discrimination Act), states that where a service provider offers

or provides services to members of the public, the provider must take such steps as is reasonable to make it

easier for disabled people to make use of the service.

Broadcasters are service providers and this therefore applies to them (DCMS Guidance 2006).

Broadcasters and programme makers are required to consider the needs of people with hearing or visual

impairments especially for dialogue, voiceovers and when mixing sound, as well as when generating onscreen

text, subtitles and graphics.

The Communications Act 2003

sets targets for broadcasters (monitored by Ofcom) to provide subtitling, sign

language and audio description services, so programme makers may be asked to provide appropriate

additional material.

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1. Video Technical Requirements

1.1. Video Formats

1.1.1. Ultra-High Definition

Material delivered to this specification must be acquired, post-produced and delivered as follows:

•

3840 x 2160 pixels in an aspect ratio of 16:9

;

•

50 or 25 frames per second progressive - known as 2160p/50 or 2160p/25;

•

colour system must be YC

only;

•

colour sub-sampled at a ratio of 4:2:0 or 4:2:2;

•

colour space –

ITU-R BT.2100,

;

•

image dynamic range

parameters detailed in

ITU-R BT.2100

must be agreed with the

broadcaster before delivery.

The UHD format is fully specified in

ITU-R BT.2100

Notes:

The frame rate must be agreed with the broadcaster before shooting begins.

For images acquired at 50 frames a second vision mixer cuts and edits shall occur so that the start

of the first frame of the progressive video pair is aligned to the start of the first (upper) field of an

interlace video signal as defined by

SMPTE ST2051

Programmes should normally be delivered with 4:2:0 colour, however some broadcasters may

require delivery with 4:2:2 colour, and this should be discussed in advance with the broadcaster.

1.1.2. High Definition

Material delivered to this specification must be acquired, post-produced and delivered as follows:

•

1920 x 1080 pixels in an aspect ratio of 16:9 as defined in

EBU TECH 3299

System 2;

•

25 frames per second (50 fields) interlaced

– known as 1080i/25, top field first;

•

colour sub-sampled at a ratio of 4:2:2;

•

colour space –

ITU-R BT.709

The HD format is fully specified in

ITU-R BT.709

1.1.3. Standard Definition

Where agreed by the broadcaster, legacy material delivered for UK SD TV transmission must be:

•

702 x 576 pixels in an aspect ratio of 16:9;

•

25 frames per second (50 fields) interlaced - known as 576i/25, top field first;

•

colour sub-sampled at a ratio of 4:2:2;

•

colour space –

ITU-R BT.601

The SD format is fully specified in

ITU-R BT.601

Note: SD video has a picture area with a minimum of 702 x 576 pixels, where the 702-pixel

wide picture must be centred in the active 720-pixel wide line. The picture information may extend

the full width of the 720-pixel wide line, providing the image shape is not distorted.

Broadcasters may commission programmes in any of the three resolutions (7680 x 4320, 3840 x 2160, 1920 x 1080)

defined in ITU-R BT.2100.

Conventional reference primaries may be optionally used as described in

SMPTE 2036-1:2014

but this limits the images to a

maximum of 60fps and does NOT permit HDR images. The reference primaries in SMPTE ST2036-1 are consistent with

Recommendation ITU-R BT.709 and their use MUST be agreed by the broadcaster BEFORE shooting commences

Details and an explanation of “image dynamic range” can be found in the ITU Report ITU-R BT.2390

This includes acquisition using the progressive segmented frame (PsF) format to carry 25fps progressive images.

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1.2. Signal Parameters

In a video signal, each primary component should lie between 0 and 100% of the video range

between black level and the peak level (R, G and B). Ideally, video levels should lie within the

specified limits so that programmes can be distributed without adjustment.

When television signals are manipulated in YUV form, it is possible to produce "illegal"

combinations that, when de-matrixed, would produce R, G or B signals outside the range 0% to

100%.

1.2.1. Video Level Tolerance

In practice, it is difficult to avoid generating signals slightly out of range, and it is considered

reasonable to allow a small tolerance:

•

the RGB components and the corresponding Luminance (Y) signal, should not normally

exceed the “Preferred Minimum/Maximum” range of digital sample levels in the table below,

•

measuring equipment should indicate an “Out-of-Gamut” occurrence only after the error

exceeds 1% of an integrated area of the active image.

For further details see the EBU Recommendation,

EBU R103

Any signals outside the “Preferred Minimum/Maximum” range are described as having a gamut

error (or as being out of gamut). Signals cannot exceed the “Total Video Signal Range” and will

therefore be clipped.

Full range video levels must not be used for delivered television programmes.

Colour gamut "legalisers" should be used with caution as they may create artefacts in the picture

that are more disturbing than the gamut errors they are attempting to correct. It is advisable not to

“legalise” video signals before all signal processing has been carried out.

1.2.2. High Dynamic Range

Guidance for HDR programmes is available in the

HDR Supplement.

However the broadcaster

must be consulted before an HDR production commences.

The Recommendation

ITU-R BT.2100

specifies two High Dynamic Range (HDR) methodologies:

Hybrid Log Gamma (HLG) and Perceptual Quantisation (PQ).

Note:

SMPTE ST 2036-1

cannot be used for High Dynamic Range images.

The HLG specification offers a degree of compatibility with legacy displays by more closely

matching the previously established television transfer curves. The PQ specification achieves a

very wide range of brightness levels for a given bit depth using a non-linear transfer function that is

finely tuned to match the human visual system.

Programmes can be mastered using either HDR method defined in

ITU-R BT.2100

•

Commissioned programmes must normally be delivered as HLG HDR.

•

Programme Acquisitions (especially movies) will normally be available as PQ HDR.

•

Conversion between the two HDR methods may be carried out using the approach described

in the Annex of

ITU-R BT.2100

•

The PQ method requires the Maximum Content Light Level (MaxCLL) to be known. MaxCLL is

the largest individual pixel luminance, measured in cd/m

, of any video frame in the in the

programme.

System

Range in Digital Sample (Code) Values

System Bit Depth

Expected Video Range

Preferred Minimum/Maximum

Total Video Signal Range

8 bit (SD Only)

16 – 235

5 – 246

1 – 254

10 bit (HD & UHD)

64 – 940

20 – 984

4 – 1019

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•

HDR programmes should normally be graded on displays with a maximum brightness of

between 1000 and 2000cd/m

For HLG productions, it is recommended that the reference level of graphics should be 75 IRE as

it leaves sufficient headroom for “specular highlights” and allows comfortable viewing when HLG

content is shown on HDR and SDR displays.

Note

: 75 IRE is equivalent to 203 cd/m

on a 1000 cd/m

reference display, or 343 cd/m

on a

2000 cd/m

reference display.

1.2.3. Blanking

Images must fill the active picture area. No ‘blanking errors’ are permitted on new, up-converted,

or archive material.

A two-pixel tolerance is permitted during CG or complex overlay sequences where key signals,

graphic overlays or other effects do not fully cover the background image. Where animated key

signals or overlays cause moving highlights at the edge of the active image it is preferable to blank

these pixels completely. A note of the timecodes and reasons for these errors should accompany

the delivered programme.

1.2.4. Field Dominance

For SD and HD programmes, cuts must happen on frame boundaries (i.e. between field 2 and field

1). Motion on

PsF

material must always occur between field 2 and field 1 (i.e. field 1 dominance).

If material is shot at

50 frames

a second, the correct 2-frame marker phasing must be maintained

when converting to

1080i/25

1080PsF/25

1.3. Video Line-Up

1.3.1. ITU-R BT.2100 UHD Programmes

ITU-R BT.2100 or ITU-R BT.2020 produced programmes must use the DPP

UHD line-up signals

The programme’s video levels must be accurately related to the relevant DPP UHD line-up signal.

The UHD line-up file includes 16-channel audio signals and is available in SDR and in HDR with

versions for HLG and PQ mastered programmes.

1.3.2. SMPTE ST2036-1 UHD, HD and SD Programmes

UHD programmes produced using ITU-R BT.709 colour space, as well as HD and SD

programmes, must use 100% colour bars (100/0/100/0) that fill the 16:9 raster. SMPTE pattern

bars are not acceptable. Programme video levels must be accurately related to their associated

line-up signals.

1.4. Origination

The EBU Recommendation

EBU R118

is used to assess the suitability of cameras. Contact the

broadcaster if there are any concerns about the suitability of a camera.

•

Cameras for UHD programmes can be UHD Tier 1 or 2, but some UHD co-producers may not

accept all cameras in UHD Tier 2.

•

UHD programmes can only be originated with progressive scan.

•

Cameras for HD programmes must meet or exceed the parameters of HD Tier 2L.

•

HD programmes may be originated with either interlaced or progressive scan (see

Film

Motion

for additional guidance).

•

Interlaced and progressive scan HD material may be mixed within a programme if it is

required for editorial reasons or the nature of the programme requires material from varied

sources.

•

SD acquired programmes should use Tier 2L cameras whenever practical and care should be

taken when down converting.

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1.4.1. DSLR Cameras

DSLR cameras are only acceptable for time-lapse sequences, stop-frame animation and other

specialist requirements such as infra-red and hostile conditions. They are

not

suitable for use as

video cameras unless they have

EBU R118

test report results that meet the UHD Tier 2 or HD Tier

2L requirements. Exceptions can be made for covert shoots or dangerous locations at the

discretion of the broadcaster. The broadcaster must agree to the use of DSLR cameras in

advance of any shooting.

1.4.2. Drones and Remotely Operated Cameras

•

Cameras attached to these devices must meet the requirements in

EBU R118

unless agreed

with the broadcaster in advance.

•

Unless a drone or remote rig has adequate image stabilisers it is recommended that the

camera attaché has a higher resolution than needed to allow electronic stabilisation to be

carried out during post-production.

Programme producers are required to ensure drones and other remotely operated cameras are

only controlled by trained and licenced operators when used in the UK. Producers should be

aware of specific local and territorial restrictions and regulations especially when drones and

remotely operated cameras are used outside the UK.

Note:

broadcasters may have additional requirements for the use of drones and remote cameras

as part of their editorial or health and safety guidelines.

1.5. Film for HD and UHD Acquisition

Super16 film is not considered to be HD or UHD no matter what processing or transfer systems

are used

The following

35mm

film types and stock are acceptable for high definition acquisition:

•

3 perf – any exposure index although an exposure index of 250 or less is preferred;

•

2 perf – only if daylight stock with an exposure index of 250 or less is used.

To avoid causing problems with high definition transmission encoding, film should be well exposed

and not forced more than one stop.

35mm stock (new or archive) scanned at UHD (or 4k and cropped to 3840) is usually acceptable

for UHD production, but the entire capture, processing, scanning and post-production workflow

must be agreed by the broadcaster in advance.

Note:

there are some circumstances where 35mm film is not suitable for UHD programme

production.

1.6. Post Production

HD and SD projects must be set to export progressively shot material as interlaced. Electronically

generated moving graphics and effects (such as rollers, DVE moves, wipes, fades and dissolves)

must be generated and added as interlaced to prevent unacceptable judder.

UHD Projects are always progressive. Electronically generated moving graphics and effects (such

as rollers, DVE moves, wipes, fades and dissolves) must be edited to prevent unacceptable

judder. For 2160p/50 deliverables, such effects must be edited at 50 frames per second. If

programmes are intended to be delivered as 2160p/25, this must be agreed with the broadcaster

in advance.

1.6.1. Video Codecs used for Post Production

Post-production codecs used to edit HD programmes should be at least 160Mb/s. It is however

acceptable to use the native camera codec provided the codec is constant throughout the

production workflow.

Requirements for programmes commissioned to acquire on Super16mm film can be found

here.

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Note:

UHD post-production codec choice will depend on the delivery frame rate and the

requirements of co-producers for a Mastering Format (such as IMF) delivery.

1.6.2. Film Motion or ‘Film Effect’

It is

not

acceptable to shoot

1080i/25

and add a film motion effect in post-production. High

Definition cameras can capture in either

1080i/25

1080p/25

. Where film motion is a

requirement, progressive capture is the only acceptable method.

Conversion from 50 progressive frames per second material to 25 progressive frames per second

is permitted, provided that the frame conversion process does not produce excessive motion

judder or image softening or visible frame blending; and that an appropriate shutter speed has

been used. The process must be agreed with the broadcaster in advance.

1.6.3. Frame Rate Conversion

To prevent image degradation, Motion Compensation standards conversion sometimes known as

Motion Predictive or Motion Vector Conversion should normally be used.

Speed change is the preferred method of converting from 24fps (including 23.976fps) to 25fps.

Due attention must be given to the audio.

Software standards conversion packages should also use Motion Compensation processing. It is

not permitted to use simple “timeline” conversion. Contact the broadcaster for more information.

Below are the recommended processes for frame rate conversion.

•

24p and 24/1.001p to 25p – speed change is the recommended conversion process.

•

24p and 24/1.001p to 50p – speed change plus frame doubling.

•

30p and 30/1.001p to 25p – Motion Compensated Conversion required.

•

30p and 30/1.001p to 50p – Motion Compensated Conversion required.

•

60p and 60/1.001p to 25p – not recommended, speak to broadcaster if required.

•

60p and 60/1.001p to 50p – Motion Compensated Conversion required.

•

HD 25PsF to UHD 25p – no frame rate conversion or de-interlacing required.

•

HD 25PsF to UHD 50p – frame doubling, no de-interlacing required.

•

SD/HD 25i to UHD 25p – use should be limited, de-interlacing.

•

SD/HD 25i to UHD 50p – de-interlacing and frame doubling.

De-interlacing processing should be carried out via a multi-field (five-field or greater) de-interlacer

or a motion compensated de-interlacer.

Content acquired at 24 (24/1.001) fps which has been converted to 60 (60/1.001) interlace or

progressive via the “2:3 pull down” process, should first have the repeated fields/frames removed

to produce the original frame rate. The resulting video can then be replayed at 25 fps.

1.6.4. Up Conversion to UHD

Archive

Lower Resolution

(HD and SD) material will usually require de-interlacing and frame

rate processing during up conversion to UHD.

It is usually best practice to convert SD or HD 60Hz standards to the equivalent SD/HD 50Hz

standard before up conversion.

1.7. Picture Aspect Ratio

All new commissions must fill a 16:9 screen vertically and horizontally without geometric distortion.

The following exception may be allowed but the broadcaster must give permission before shooting

commences.

1.7.1. ‘Cinemascope Ratios’ as Letterbox

Movies delivered to dedicated movie channels should be delivered with an active picture ratio that

matches the current consumer release unless the broadcaster requests otherwise. Other

programmes may use wider picture ratios if agreed in advance by the broadcaster.

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Movies and programmes with picture ratios of 2.35:1/2.39:1 (21:9) or 1.85:1 should be centred

vertically between black bars in a 16:9 frame with no geometric distortion. If there are any variants

of aspect ratio please contact the broadcaster to establish the required version.

1.7.2. Floating Images

Short sequences of images surrounded by black borders (floating images) may be used for artistic

effect. However, widescreen consumer TV sets operating in Auto Zoom / Auto mode often

interpret large black borders at the top and bottom of the screen as letterbox, so are likely to

enlarge the picture. The resulting unpredictable zooming can be annoying for the viewer and

undermine the artistic intent. If used, the black space around floating images must be consistent

across sequences of images.

1.7.3. ‘Pillar-Boxed’ HD Material

Some ‘pillar-boxed’ material is acceptable at the discretion of the broadcaster where it has been

acquired on a medium that has the capability to be transferred to a legitimate HD or UHD

resolution, for example, 35mm film shot using 4-perf at an aspect ratio narrower than 16:9. The

pictures must be centrally framed in a 16:9 raster with no geometrical distortion.

1.8. Archive Material

Archive material must meet all the technical requirements in this document, including those for up-

converted SD video where relevant.

1.8.1. General Quality

Archive material must be taken from the best available source, and any improvement or

restoration work which could reasonably be expected must be done (for example grading, dropout

repair or audio equalisation).

1.8.2. Up-Converted SD Material

Particular care must be taken with SD archive material in order to deliver the best possible quality

after up-conversion. In general standard definition pictures must look no worse than the original

after being up converted, post processed and down converted for delivery on SD services. Only

high quality up-conversion processes will achieve this.

•

Standard definition video contains a half-line at top and bottom on alternate fields. This must

be removed on up-conversion to HD or UHD, or it will be visible flickering at top and bottom of

the HD/UHD frame.

•

Any VITC or switching signals visible at the top of SD material must be removed.

•

Any line blanking from SD signals must not appear in the HD or UHD conversion.

For these reasons all SD material must be zoomed-in by a small amount during up-conversion.

1.8.3. Picture Aspect Ratio

Archive material that is not 16:9 should be zoomed to fill the 16:9 raster where possible without

compromising the image quality or composition. Alternatively, it may be presented in a pillar-box or

letterbox format, which:

•

may be of an intermediate ratio between 4:3 and 16:9, but must be of consistent width across

sequences;

•

must be centrally framed in the 16:9 raster;

•

must show no geometrical distortion;

•

must have clean and sharp pillar-box edges (i.e. any video or film edge artefacts may need to

be blanked);

•

must be black outside the active picture, unless otherwise specified by the broadcaster.

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1.8.4. Safe Areas

Any archive captions or on-screen-text already in the archive material should be kept within the

caption safe area if possible. Exceptions should be noted in the accompanying QC documents.

1.9. Use of Lower Resolution Images

To maintain a high standard and meet audience expectations, the amount of material of a lower

resolution than the commissioned format is limited to

25%

of the programme’s total duration.

Lower resolution material must not be used for large uninterrupted sections of the programme,

unless agreed by the broadcaster.

1.9.1. Non-UHD Material

Some UHD programmes will contain some material from standard definition and high definition

originals, and sources that do not meet the UHD requirements. This material is all called ‘non-

UHD’ in this document.

Non-UHD material includes material acquired using the following methods or formats:

•

All SD and HD formats;

•

Cameras that do not meet the requirements of

EBU R118

for UHD Tier 2;

•

All codecs with bit rates below those specified in

EBU R118

for UHD;

•

Film that does not meet the

required standard

1.9.2. Non-HD Material

Some HD programmes will contain some material from standard definition originals, and sources

that do not meet the HD requirements. This material is all called ‘non-HD’ in this document.

Non-HD material includes and material acquired using the following methods or formats:

•

HDV from all manufactures;

•

All codecs with bit rates below those specified in

EBU R118

for HD Tier 2L;

•

Cameras that do not meet the requirements of

EBU R118

for HD Tier 2L;

•

Material generated or processed on 720-line equipment;

•

Film that does not meet the

required standard.

1.10. 3D

Programmes delivered for 3D transmission will be subject to additional requirements and

agreement with the broadcaster. The

broadcaster section

gives details of 3D production and

delivery.

1.11. Safe Areas for On-Screen Text

All on screen text must be clear and legible and must be within the safe areas specified. All font

sizes must be legible after down conversion.

There are two primary caption safe areas defined for UK transmission of 16:9 programmes.

At the discretion of the broadcaster, programmes such as feature films and some acquisitions may

be excluded from this requirement.

• 16:9 safe

used by most UK programmes/broadcasters.

• 4:3 safe

required by some broadcasters for end credits or for programmes distributed

internationally. Check the broadcaster requirements for guidance on end credits.

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1.11.1. Text Size

The minimum SD font height is 20 SD lines. Therefore where burnt in UHD or HD text will be down

converted, the minimum height of the text should be no less than:

•

40 HD lines/pixels (to be legible after down conversion);

•

80 UHD lines/pixels (to be legible after down conversion).

1.11.2. In Vision Captions for Foreign Language Assets

Foreign dialogue should have burnt-in English subtitles, free from spelling and grammatical errors,

and held for a sufficient time to be comfortably read. Subtitles must also be clearly visible at all

times; if subtitles are positioned over an area of the screen which is the same colour as the font; a

trim or drop shadow must be utilised and for consistency this should be used on all subtitles

throughout the programme or feature.

1.11.3. Safe Areas for SD On Screen Text

Text Safe Area for

720 x 576 (Interlace)

Defined as

percentage (%) of

active picture

SD pixels (inclusive) first

pixel numbered 1

TV line numbers (inclusive) line

numbering as per

ITU-R BT.601

16:9 Text safe

90% of Width

90% of Height

36 – 684

29 – 546

38 – 295 (F1) & 351 – 608 (F2)

4:3 Text safe

67.5% of Width

90% of Height

117 – 603

29 – 546

38 – 295 (F1) & 351 – 608 (F2)

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1.11.4. Safe Areas for HD On Screen Text

Text Safe Area for

1920 x 1080

(Interlace)

Defined as

percentage (%) of

active picture

HD pixels (inclusive) first

pixel numbered 1

TV line numbers (inclusive) line

numbering as per

“ITU-R BT.709”

16:9 Text safe

90% of Width

90% of Height

96 – 1 823

54 – 1025

48 – 533 (F1) & 611 – 1096 (F2)

4:3 Text safe

67.5% of Width

90% of Height

312 – 1 607

54 – 1025

48 – 533 (F1) & 611 – 1096 (F2)

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1.11.5. Safe Areas for UHD On Screen Text

Text Safe Area for

3840 x 2160

(Progressive)

Defined as

percentage (%) of

active picture

UHD pixels (inclusive) first

pixel numbered 1

UHD Standards do not specify TV line

numbers

16:9 Text safe

90% of Width

90% of Height

192 – 3647

108 – 2052

4:3 Text safe

67.5% of Width

90% of Height

624 – 3215

108 – 2052

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2. Audio Technical Requirements

2.1. Dialogue

Broadcasters receive many complaints about unclear dialogue. Remember the audience has not

seen the programme many times before transmission and has not seen a script. The audience

does not usually have “broadcast quality” audio reproduction equipment. It is the responsibility of

the producer to ensure that dialogue is clear, easy to hear and to understand by a first-time viewer

who is using consumer equipment.

2.2. Loudness

It is no longer acceptable to deliver new programmes mixed to the old PPM6 specifications.

Programmes must be mixed to comply with

EBU R128

. Exceptions may be made for movies

intended for dedicated movie channels or platforms. Where the broadcaster requires a Blu-

Ray/DVD surround mix with a greater dynamic range, a stereo R128 mix must also be supplied.

The Broadcaster will supply details of how the audio is to be delivered in these cases.

2.2.1. Loudness terms

R128 terms used in this document, how they are measured and the DPP delivery requirements

are listed below.

All programmes must be compliant with the Programme Loudness and Maximum True Peak

requirements below. Other parameters are currently given for guidance only.

Term

Description

Measurement

Reference

Loudness Unit

1LU = 1dB change in

loudness

EBU Tech 3343

LUFS

Loudness Unit relative to

Full Scale

LUFS

EBU Tech 3343

LRA

Loudness Range

EBU Tech 3342

DPP Delivery Requirements

Programme Loudness

(

EBU Tech 3343

)

The loudness measured

over the duration of the

programme.

LUFS

Non-live

-23.0 LUFS ±0.5LU

Live (including as-live)

-23.0 LUFS ±1.0LU

Maximum True Peak

(

EBU Tech 3343

)

The maximum value of the

audio signal waveform.

dBTP (True Peak)

It is recommended that the

maximum true peak level

should not exceed -

3dBTP. Content will fail if the

maximum true peak exceeds

-1dBTP

Loudness Range is for guidance only

Loudness Range

(

EBU Tech 3342 & 3

)

This describes the

perceptual dynamic range

measured over the

duration of the programme

Programmes should aim for

an LRA of no more than

18LU

Loudness Range of

Dialogue

Dialogue must be acquired

and mixed so that it is clear

and easy to understand

Speech content in factual

programmes should aim for

an LRA of no more than 6LU

A minimum separation of

4LU between dialogue and

background is recommended

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Although the target loudness is -23 LUFS, in exceptional circumstances other target levels may be

permitted by agreement with the broadcaster. Other target levels must be agreed with the

broadcaster before the final mix.

2.2.2. Guidelines for True Peak Audio Levels

The following table is

only for guidance

on the true peak levels of different types of audio. At all

times dialogue should be distinct and clear.

2.3. Metering Requirements

Meters must comply with the specifications in

EBU Tech 3341

. Programmes must be measured

using the EBU Integrated (I) mode and the measurement must be applied to the whole programme

(

EBU Tech 3343

). The optional LFE channel must be excluded from all measurements.

2.4. Stereo Audio Requirements

Stereo tracks must carry sound in the A/B (Left/Right) form.

If mono originated sound is used, it must be recorded as dual mono, so that it may be handled

exactly as stereo. It must meet all the stereo standards regarding levels, balance and phase.

2.4.1. Stereo Line-Up Tones

Each stereo audio pair must have either EBU stereo

GLITS line-up tone (not a mix of both).

Tone must be 1kHz (2kHz is acceptable on M&E channels), sinusoidal, free of distortion and

phase coherent between channels. Audio files of GLITS and EBU stereo tones may be

downloaded from the

DPP website.

Digital Audio Reference level is defined as 18dB below the maximum coding value (-18dBFS).

2.4.2. Stereo Phase

Stereo programme audio must be capable of down-mixing to mono without causing any noticeable

phase cancellation.

2.5. Surround Sound Requirements

Surround sound is transmitted in the 5.1 format, and should be delivered as discrete tracks.

Surround sound programmes must also include a stereo mix that meets all requirements for stereo

delivery. This should generally be an automated down-mix of the surround channels, using the

same down-mix parameters as are held in the metadata.

For both the surround mix and stereo down-mix to comply with EBU R128 the down-mix should be

normalised before layback.

Stereo and surround audio tracks must be synchronous.

2.5.1. Surround Line-Up Tones UHD Programmes

All DPP UHD file delivered programmes must use the DPP line up signal available

here.

Material

Recommended

Maximum Peaks

Uncompressed Music

-3 dBTP

Compressed Music (depending on degree of compression)

-10 dBTP

Heavy M & E (gunshots, warfare, aircraft, loud traffic, etc.)

-3 dBTP

Background M & E (office/street noise, light mood music etc.)

-18 dBTP

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2.5.2. Surround Line-Up Tones HD Programmes

Each group of surround tracks must carry BLITS tone. Tones must be sinusoidal, free of distortion

and phase coherent between channels. Stereo tracks derived by down-mixing from the 5.1 audio

should carry a down-mix of the BLITS tones, using the same down-mix parameters as those

specified in the accompanying metadata. Any other stereo tracks delivered with the programme

must carry stereo tone. An audio file of BLITS tone may be downloaded from the

DPP website.

is acceptable to use either the EBU or the

DPP UHD

versions of BLITS tone (not a mix of both) on

HD programmes.

2.5.3. AES Sample Timing

Very small timing differences between audio tracks in a surround programme will not be heard

unless the stereo down-mix is monitored acoustically. An error of as little as one or two samples

between the Left, Right and Centre channels can cause phasing and comb filtering for those

listening in stereo.

Timing differences between audio channels must be no more than 0.2 samples (i.e. the timing

between each channel of the six audio tracks of a surround sound signal).

2.6. Surround Sound Mixing Requirements

To help programme makers meet their responsibilities, it is important that all transmitted audio can

be easily and clearly monitored by both Editorial and Technical staff during the production process.

To maintain a house style for certain programme types or strands, broadcasters may have specific

requirements for the mixing mode as described below.

2.6.1. Dialogue in a Surround Mix

There are three modes for the placing of dialogue in a surround mix.

Mode 1

All dialogue should be present in each of the three front channels – but this does not

mean that the dialogue must be at equal level in each of the front channels. Mode 1 is

generally more suited to the home listening environment.

Mode 2

In-vision dialogue across the three front channels and out-of-vision dialogue in the centre

channel only.

Mode 3

All dialogue in the centre channel only. Mode 3 is similar to cinema mixing and as such

may be the least suited to the home listening environment.

For details of the mode required for each programme type see the

broadcaster section

at the

beginning of this document.

2.6.2. General Mixing Requirements

The stereo mix delivered with a surround programme will not be transmitted on the HD platforms.

Viewers of the HD channels listening in stereo (or mono) will always hear a receiver derived

automated down-mix of a surround sound programme using the Dolby Metadata parameters. HD

platforms only transmit AC3 (DSAT) or AAC (DTT) audio either as Stereo or Surround.

The stereo mix may not be transmitted on the Standard Definition channel(s) either, depending on

platform. Some SD channels already only transmit an automated down-mix and this practice will

increase.

The audio parameters controlled by the metadata include: centre and rear down-mix levels, LFE

level, and the extent of any dynamic range control applied. Therefore:

•

it is essential to check the automated down-mix using a monitoring system that applies or

simulates the metadata settings. Any external processor (e.g. a Dolby DP570) must be set to

apply the programme’s metadata;

•

the Lt/Rt and Lo/Ro fold-down parameters used for down mixing must match the settings in

the Dolby metadata – especially the down-mix levels of the CENTRE and SURROUND legs;

•

pre-mixed stereo content should be up-mixed, where appropriate, to match the surround

sound to maintain the audio image throughout a surround broadcast. A method of up mixing

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approved by the broadcaster must be adopted, which anchors dialogue to the front and

disperses effects around the image;

•

up-mixed material must also down-mix to stereo and mono with no audible artefacts. The

injudicious use of phase shifting and delay within some up-mixing algorithms may become

more noticeable in the subsequent receiver down-mix process, and result in unacceptable

down-mixed audio;

•

where up mixing is not available, stereo sections or inserts containing speech should be

“converged” (spread) across LEFT, RIGHT and CENTRE channels adding an element into the

Centre channel of the surround mix.

The front L/R channel levels should generally be 6dB

lower than the Centre-channel level.

For general surround sound (e.g. audience reaction) phase-coherence invariably benefits both the

wrap-around effect in 5.1 and the stereo down-mix. Coincident microphone techniques (e.g.

crossed-pairs) tend to outperform spaced mono microphones in this context.

2.6.3. Stereo and Centre Channel Monitoring

It is essential that the mono and stereo down-mixes of a surround programme are monitored in at

least equal measure to the surround mix. A large majority of viewers will be listening in stereo

rather than 5.1 for some time to come.

It is also important to be aware that the centre channel could allow viewers listening in surround to

overhear off-microphone conversation not intended for broadcast, but which may be masked when

monitoring in stereo or mono.

2.6.4. Consistency of Image

When a surround programme contains mono content interleaved with stereo pre-recorded items it

is important to maintain the consistency of the sound image and prevent the effect of dialogue

appearing to jump between Centre Only and Phantom Centre (Left/Right) only.

2.7. Dolby Metadata Settings

For the correct reproduction of the audio by domestic receivers, it is vital that the correct metadata

is input and carried through the broadcast chain to the consumer. There are differences in the

settings based on programme type or genre as well as requirements for specific or dedicated

television channels (e.g. Sport Channels, Movie Channels, Music Channels etc.).

Dolby metadata must remain constant throughout a programme.

It is not possible to publish a common set of Dolby metadata settings that would be appropriate for

all programmes styles. The DPP broadcasters have limited the parameters that can be varied to

the following:

•

Dialogue Level;

•

Line Mode Compression;

•

RF Mode Compression;

•

Centre Down-Mix Level;

•

Surround Down-Mix Level;

•

Surround 3dB Attn.;

•

Dolby Surround Mode;

•

Preferred Stereo Down-Mix;

•

Surround Phase Shift.

For details of the settings required for each programme type see the Part 3 Section 6.5

Surround

Sound requirements

Where required, Dolby surround metadata specified in SMPTE RDD 6 must be carried in an

SMPTE ST 436 track, as detailed in the

AS-11 UK DPP HD

specifications.

See the

Surround Sound Supplement

for details of how to add the metadata to AS-11 UK DPP

HD files.

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2.7.1. Guidance for Acquired Programmes and Movies

Acquired programmes and movies can be received with or without metadata. Unless the audio is

re-mixed during a compliance edit, any supplied metadata should be passed though. If no

metadata exists the following parameters should be used.

2.8. Sound to Vision Synchronisation

The relative timing of sound to vision should not exhibit any perceptible error. Sound must not lead

or lag the vision by more than 5ms.

2.8.1. Audio / Video Sync Markers

To assist in maintaining A/V sync through the post-production process, a ‘sync plop’ should be

used which must meet the following conditions:

•

the sync plop must be between timecode 09:59:57:06 and 09:59:57:08;

•

the audio plop must be 1kHz tone in all channels (82.5Hz in the LFE channel) at -24dBFS

(-18dBFS is acceptable for stereo programmes);

•

the duration of the vision flash must be 2 frames to allow it to pass through standards

conversion successfully;

•

the duration of the audio plop must be 1 frame, starting on the first frame of the vision flash. It

must be synchronous across all audio channels and with the video flash (within ±5ms).

If an end sync plop is used it must be no closer than 10 seconds to the end of the programme and

comply with the relevant points above.

Parameter

Value

Dialogue Level

-23dB

Line Mode Compression

Film Standard

RF Mode Compression

Film Standard

Centre Down-Mix Level

-3dB

Surround Down-Mix Level

-3dB

Surround 3dB Attn.

Movies – Enabled

All others – Disabled

Dolby Surround Mode

Enabled

Preferred Stereo Down-Mix

LtRt

Surround Phase Shift

Enabled

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3. Quality Control (QC)

It is the responsibility of the production company to ensure programmes meet the technical and

editorial requirements of the commission. This responsibility includes ensuring the company

carrying out the QC process has adequate resources.

3.1. General Quality

All programmes are expected to reach a high standard of video and audio quality. This does not

mean low quality material cannot be used. Archive and specialist low quality material used in

context is acceptable. If there is any doubt, contact the broadcaster for advice.

3.1.1. General Video Quality

The picture must be well lit and reasonably but not artificially sharp.

The picture must be free of excessive noise, grain and digital compression artefacts.

The picture must be free of excessive flare, reflections, lens dirt, markings and obstructions (e.g.

lens hood), and lens aberrations.

Movement must appear reasonably smooth and continuous, and must not give rise to distortions

or break-up to moving objects, or cause large changes in resolution.

The picture must be free of excessive black crushing and highlight compression. Hard clipping of

highlights (e.g. by legalisers) must not cause visible artefacts on screen.

There must be no noticeable horizontal or vertical aliasing, i.e. jagged lines, or field-rate or frame-

rate fluctuations in fine detail.

Colour rendition, especially skin tones, must be consistent throughout, and provide a realistic

representation of the scene portrayed unless it is altered as an editorially essential visual effect.

The picture must be stable and continuous – i.e. no jumps, movements, shifts in level or position.

There should be no flash frames or very short shots unless editorially essential.

There must be no visible contouring / artefacts caused by digital processing. Quantisation noise

must not be apparent.

There must be no noticeable spurious signals or artefacts e.g. streaking, ringing, smear, echoes,

overshoots, moiré, hum, cross-talk etc.

3.1.2. General Audio Quality

Sound must be recorded with appropriately placed microphones, giving minimum background

noise and without peak distortion.

The audio must be free of spurious signals such as clicks, noise, hum and any analogue distortion.

The audio must be reasonably continuous and smoothly mixed and edited.

Audio levels must be appropriate to the scene portrayed and dynamic range must not be

excessive. They must be suitable for the whole range of domestic listening situations.

Surround and Stereo audio must be appropriately balanced and free from phase differences which

cause audible cancellation in mono.

The audio must not show dynamic and/or frequency response artefacts due to the action of noise

reduction or low bit rate coding systems.

3.1.3. UHD Programmes

QC requirements for UHD programmes

must

be discussed with the broadcaster before shooting

begins. Initially quality controls will be on a genre-by-genre basis. In time, as broadcasters and co-

producers gain a better understanding of UHD they will be able to provide more guidance.

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3.2. Photosensitive Epilepsy (PSE)

Flickering or intermittent lights and certain types of repetitive visual patterns can cause serious

problems for viewers who are prone to photosensitive epilepsy. Children and teenagers are

particularly vulnerable.

All UK Television channels are subject to the

Ofcom BROADCASTING CODE

2016

which states:

Section 2.12

Television broadcasters must take precautions to maintain a low level of risk to viewers who have

photosensitive epilepsy. Where it is not reasonably practicable to follow the Ofcom guidance (see the

Ofcom website), and where broadcasters can demonstrate that the broadcasting of flashing lights and/or

patterns is editorially justified, viewers should be given an adequate verbal and also, if appropriate, text

warning at the start of the programme or programme item.

The Ofcom guidance is

here

3.2.1. PSE testing

Programmes for file delivery must be tested using any file based PSE device that meets the

guidance given by Ofcom. The DPP maintains a list of devices, available

here.

Live and as live programmes may continue to use the Cambridge Research FPA 2.5 PSE device.

Additional requirements for Tape and Live programmes are given in the Tape and Live versions of

the DPP delivery specifications.

Broadcasters require a PSE report (pass certificate) to be delivered with all programmes.

•

PSE reports must be in pdf form and named according to the broadcaster’s naming

convention.

•

The relevant metadata details (paperwork for tape) must be completed.

•

It is recommended that live programmes produce and keep a copy of the PSE checks carried

out during the final rehearsal (if there is one) and the transmission.

Any failure whatsoever will result in rejection of the programme, and any affected sections must be

repaired and re-tested before acceptance.

3.2.2. PSE – broadcast warnings

In exceptional cases, verbal and/or on-screen text warnings may be used at the beginning and

during the programme. Each broadcaster has a policy on the inclusion of content that may cause

harm or offence and will only be considered if:

•

demonstrable attempts have been made to correct or replace the images,

and

•

the relevant content is completely integral and necessary to the context of the programme,

and

•

permission to use the relevant content has been cleared by the broadcaster and documented

in writing by those responsible for the commissioning/editorial content.

No broadcaster allows a programme maker to authorise the use of warnings for material that fails

a PSE test. Advance notification and planning requirements will vary by broadcaster.

3.2.3. UHD Programmes

All UHD programmes have a wider colour space than HD or SD programmes so only approved

PSE devices can be used (irrespective of the dynamic range). It should be noted that there is no

change to the current PSE requirements for testing HDR content. Contact the broadcaster for the

latest advice on testing UHD programmes.

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3.3. Automated Quality Control (AQC)

Any device that carries out the DPP AQC tests based on the EBU QC Test Items can be used.

Details of the DPP QC requirements can be found

here.

The production company should ensure that all technical and editorial warnings or comments are

acted on or noted. Mandatory requirements must be acted on or rectified. Broadcasters require an

AQC report in PDF form, to be delivered with the master programme.

3.4. Eyeball Quality Control

Broadcasters require an eyeball QC report in PDF form, to be delivered with the programme file.

The eyeball QC check is to ensure video and audio quality are consistent throughout. Further

information on the eyeball QC parameters and an eyeball QC form template can be found

here.

3.5. File Compliance (File delivery only)

The File Compliance check confirms that the file itself meets the

AS-11 UK DPP

technical

requirements. A compliance check is carried out by the broadcaster before a programme file can

be accepted. AQC devices with a

AMWA Format Conformance Testing Certificate

can be used

to check AS-11 compliance.

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Part 2 – File Delivered Programmes

File Requirements

This part of the document details the additional technical requirements that programmes must comply with for

the successful delivery of File programmes

4. Programme Format

4.1. Programme Layout for File Delivery

All programmes delivered on file must be laid out with elements in the following pattern relative to

timecode:

4.2. Programme Parting

There must be only

one

programme in each file, although a programme may be either soft or

hard-parted within that file, as specified by the broadcaster, according to the diagrams below. Only

when agreed in advance with the relevant broadcaster, programmes in several parts may be

delivered in more than one file.

4.2.1. Single Part or Soft Parted Programme

Time-code

Duration

Video

Audio

09:59:30:00

20”

UHD programmes made to

SMPTE ST 2036 & all HD/SD

programmes must use

100% Bars (100/0/100/0)

HD/SD Line-up tone

UHD BT.2100 UHD Line-up

SDR

UHD DPP UHD Tone

UHD BT.2100 UHD Line-up

HDR

09:59:50:00*

At least 7”

Ident Clock or Slate

Silence

09:59:57:06 (optional)

2fr

2 Frames minimum 50% white

1 Frame 1kHz tone

(on first white frame)

no later than 09:59:57:08

At least 2” 18fr

Black

Silence

10:00:00:00**

Programme

For Multipart Programmes

end of part

5”

freeze or ‘living hold’ after end of

part

fade or cut to silence by end

of part

end of part + 5”

At least 1”

Black

Silence

next whole minute minus 10”

7”

Ident Clock or Slate – next part

Silence

Start of part minus 3”

3”

Black

Silence

end of programme

5”

freeze or ‘living hold’

fade or cut to silence by end

of programme

end of programme + 10”

(optional)

2fr

2 Frames minimum 50% white

1 Frame 1kHz tone

(on first white frame)

*For legacy delivery the 90 second line-up and 30 second Ident Clock or Slate can be used

**For programmes delivered on multiple files, 2nd and subsequent files should have programme part starting at the

next ‘whole hour’ T/C with line-up and ident laid out as above with appropriate offset.

TECHNICAL SPECIFICATION FOR THE DELIVERY OF TELEVISION PROGRAMMES AS AS-11 FILES

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UK DPP File v5.0 - 2017

Channel 4 File v5.2 - 2022

A single part programme will always be played from the start point to the end point without

interruption. Soft parting is where a programme is provided as a single continuous programme, but

the broadcaster may break the transmission of the programme at several points to insert

commercials or for other reasons. IN and OUT points for continuous playback must be included

with the delivery metadata; suggested timecodes for breaks should

not

be included.

4.2.2. Hard-Parted Programme

A hard-parted programme is billed and scheduled for transmission as a single entity, but is

delivered as a single file containing clearly separated parts between which adverts, trails etc. will

be inserted. Although it is acceptable for each part to start at the top of a minute, see the

broadcaster section

for specific hard parting requirements.

Hard Parted programmes should be formatted as shown. The start timecode and duration of each

part must be included in the metadata.

 IN

OUT 

 IN

OUT 

 IN

OUT 

LINEUP

IDENT /

CLOCK

PART 1 of …

BLACK OR

LIVING HOLD

CLOCK

PART 2 of …

BLACK OR

LIVING HOLD

CLOCK

PART 3 of …

BLACK OR

LIVING HOLD

BLACK

Textless or

other material

4.3. Multi-Part Programme Delivered on Multiple Files

Where a programme’s delivery must be split over more than one file, it must comply with the

formatting below.

FILE 1

FILE 2

4.4. Start and End

It is usual for the sound and vision to be automatically cut to air on transmission, so early vision or

sound is not normally required. Vision may fade up from black starting at 10.00.00.00 if desired.

All programmes must end with a fade or cut to silence

before

the intended end point. Any fade out

or reverb must be allowed for within the programme duration.

Vision freeze or ‘living hold’ must be held for a further 5” after the end point.

Any other programme elements after the end of the programme should not start less than 1min

after end of programme.

4.5. The Ident Clock or Slate

A countdown clock or slate clearly displaying the following information must precede the start of

programme. A clock or slate is required for subsequent parts of a multi-part programme:

•

Programme I.D. number;

•

Programme title (and series number if applicable);

•

Episode number (if applicable);

•

Episode subtitle (if applicable);

•

Version (pre/post watershed etc. if necessary);

•

Part number (if applicable).

 IN

OUT 

LINEUP

IDENT /

CLOCK

PROG

BLACK OR

LIVING HOLD

BLACK

Textless or

other material

 IN

OUT 

 IN

OUT 

 IN

OUT 

LINEUP

IDENT /

CLOCK

PART 1 of 6

BLACK OR

LIVING HOLD

CLOCK

PART 2 of 6

BLACK OR

LIVING HOLD

CLOCK

PART 3 of 6

BLACK OR

LIVING HOLD

BLACK

Textless or

other material

 IN

OUT 

 IN

OUT 

 IN

OUT 

LINEUP

IDENT /

CLOCK

PART 4 of 6

BLACK OR

LIVING HOLD

CLOCK

PART 5 of 6

BLACK OR

LIVING HOLD

CLOCK

PART 6 of 6

BLACK OR

LIVING HOLD

BLACK

Textless or

other material

TECHNICAL SPECIFICATION FOR THE DELIVERY OF TELEVISION PROGRAMMES AS AS-11 FILES

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UK DPP File v5.0 - 2017

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No technical information may be included. The clock or slate may display telephone contact

numbers for the post-production facility and production company, and may display company

branding.

Where a moving clock is used, it must provide a clear countdown of at least 7 seconds, including a

hand moving in 1 sec steps (i.e.

not

smooth motion) around a circular clock face. Clocks with only

digital countdown are not acceptable.

•

There must be no audio tone or ident over the clock.

4.6. Audio Channel Allocations HD and SD

HD files must contain either 4 or 16 channels of audio. SD files must contain 4 channels of audio

(additional “deactivated” channels are technically stored in the file but these are not “usable” /

“valid”). Audio content must be delivered in accordance with the table below. The EBU R48 or

R123 code must be included in the metadata.

* additional mono or stereo (e.g. audio description, language)

Note:

•

R123:4b is the normal layout for stereo programmes;

•

R123:16c is the normal layout for surround programmes;

•

R48:2a, R48:4b, R123:4b, R123:4c, R123:16c must only be used for programmes with single

language soundtracks;

•

R123:16d must only be used for programmes with dual language soundtracks;

•

R123:16f must only be used for programmes with 3 different language soundtracks.

Any unused audio tracks (including where you do not have an M&E) in the 16 track groups above

must contain digital silence, encoded as PCM audio.

For compatibility with stereo systems, any audio generated as mono must be presented on two

phase-coherent tracks, and flagged as stereo.

Any additional audio tracks required by the broadcaster must be delivered separately as ‘B-WAV’

files.

The naming conventions used in all related documentation and metadata must match those

specified above.

Audio track numbers

EBU

Reference

Programme

Type

R48: 2a

Stereo

Final Mix

Stereo

Final Mix

Silence

R123:4b

Stereo with

M&E

Stereo

Final Mix

Stereo

Final Mix

Stereo

M&E

Stereo

M&E

R123:4c

Stereo with

Audio

Description

Stereo

Final Mix

Stereo

Final Mix

Stereo

Audio

Des

Stereo

Audio

Des

R123:16c

(5.1 with

M&E)

Stereo, 5.1 &

M&E

Stereo

Final Mix

Stereo

Final Mix

Stereo

M&E

Stereo

M&E

5.1

Final Mix

5.1

Final Mix

5.1

Final Mix

5.1

Final Mix

LFE

5.1

Final Mix

5.1

Final Mix

5.1

M&E

5.1

M&E

5.1

M&E

5.1

M&E

LFE

5.1

M&E

5.1

M&E

R123:16c

(5.1 with AD)

Stereo, 5.1 &

Audio

Description

Stereo

Final Mix

Stereo

Final Mix

Stereo

Audio

Des

Stereo

Audio

Des

5.1

Final Mix

5.1

Final Mix

5.1

Final Mix

5.1

Final Mix

LFE

5.1

Final Mix

5.1

Final Mix

5.1

M&E

5.1

M&E

5.1

M&E

5.1

M&E

LFE

5.1

M&E

5.1

M&E

R123:16d

5.1 Two

Languages

5.1

Lang 1

5.1

Lang 1

5.1

Lang 1

5.1

Lang 1

LFE

5.1

Lang 1

5.1

Lang 1

5.1

Lang 2

5.1

Lang 2

5.1

Lang 2

5.1

Lang 2

LFE

5.1

Lang 2

5.1

Lang 2

R123:16f

Three

Languages

Stereo

Lang 1

Stereo

Lang 1

Not

Used

Not

Used

Stereo

Lang 2

Stereo

Lang 2

Not

Used

Not

Used

Stereo

Lang 3

Stereo

Lang 3

Not

Used

Not

Used

TECHNICAL SPECIFICATION FOR THE DELIVERY OF TELEVISION PROGRAMMES AS AS-11 FILES

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UK DPP File v5.0 - 2017

Channel 4 File v5.2 - 2022

4.7. Audio Channel Allocations AS-11 DPP X1

The MXF file:

•

must only include Sound Tracks as specified in this document;

•

must use “Audio Layout Mode 1” (note: this is defined in

AS-11 DPP X1

MXF files using audio channel labelling defined in SMPTE ST377 may contain up to 128 audio

tracks. These tracks may be in any order and may contain up to 128 channels in any configuration

BUT the sound tracks listed in the table below must always be included in the MXF file in the order

specified.

Any additional Sound Tracks that are included in the MXF file must be as specified in the table

below. The inclusion of additional Sound Tracks must be discussed in advance with the

broadcaster.

Exactly one Dolby Audio Metadata Bitstream must be included in the MXF file. This bitstream must

contain metadata that is accurate for all of the 5.1 Sound Tracks included in the MXF file.

Note: The

AS-11 UK DPP X1

Specification mandates how a Dolby Audio Metadata Bitstream is

embedded in the MXF file.

4.8. Audio Only Files

Additional audio only files related to a programme, such as Audio Description files, must be

supplied as BWF (sometimes called ‘B-WAV’) files, conforming to the specification in

EBU-Tech

3285

. File duration and timecode must exactly match the principal MXF file.

4.9. Closed Captions (Subtitles)

Closed captions or subtitles must be delivered as a separate file as required by each broadcaster.

The separate file must be named identically to the principal MXF file, apart from the filename

extension.

5. File Requirements

Sound

Tracks

Channels per

Track

Content

Channel Order in

the Track

Language

Number Sound

Tracks per file

Track

Stereo Main Mix

L, R

Eng

Track

Surround Main Mix

L,R,C,LFE,Ls,Rs

Eng

Sound Track Play-out

(SoundfieldGroup Label)

Sound

Tracks

Content / Purpose

(GroupOfSoundfieldGroups Label)

Language

Number Sound

Tracks per file

Stereo

(SMPTE20678StandardStereo)

Alternative Mix (such as an

additional language)

(AlternativeProgram)

Music & Effects (M&E)

(MusicAndEffects)

Ask broadcaster

5.1

(_51SoundfieldGroup)

Same as the Stereo Sound

Track above

(AlternativeProgram)

(MusicAndEffects)

1 for each Stereo

Sound Track above

Stereo

(SMPTE20678StandardStereo)

Audio Description Mixed with

Programme Audio

(AudioDescriptionProgramMix)

Ask broadcaster

Mono & Control

(AudioDescriptionStudioSignal)

Audio Description

(AudioDescription)

Ask broadcaster

TECHNICAL SPECIFICATION FOR THE DELIVERY OF TELEVISION PROGRAMMES AS AS-11 FILES

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5.1. UHD Files

The programme must be delivered to the

AS-11 DPP X1

specification (“MXF Program Contribution

– DPP UHD”). Further details about UHD file programmes are given in the

broadcaster section

5.1.1. UHD Video Codec

The video essence in the file must be encoded as AVC / H.264. Long GoP or I-Frame must be

discussed in advance with the broadcaster.

The AVC / H.264 coded video in each MXF file must have a mean data rate (mean value across

the entire file) of at least:

Note:

These data rates are likely to be revised as the standards related to UHD mature and more

practical experience is gained.

5.1.2. UHD High Dynamic Range

The choice of HDR type (and any special arrangements needed for delivery of the file that arise as

a consequence) must be discussed in advance with the broadcaster.

HDR requirements are detailed in Recommendation

ITU-R BT.2100

and the Report

ITU-R

BT.2390

5.1.3. UHD Audio

UHD programmes must be delivered with

both

Stereo and Surround (5.1) audio. See

Audio

Channel Allocation

5.1.4. UHD Additional Requirements

AS-11 X1 DPP UHD

files will contain:

•

An embedded XML document containing descriptive metadata;

•

A Segmentation Track to identify the in-point and out-point of each programme segment.

5.2. HD Files

The programme must be delivered to the

AS-11 UK DPP HD

specifications that describe exactly

how the file must be constructed to meet DPP requirements. The HD file must contain the required

metadata.

5.2.1. HD Video Codec

The video essence in the file must be encoded as AVC Intra Class 100 as defined by SMPTE RP

2027. This equates to an actual video essence data rate of approximately 113Mbits/s. The

AS-11

UK DPP HD

specification gives full technical details of how the file should be constructed.

5.2.2. HD Audio

All audio tracks must be encoded as PCM with a sample rate of 48kHz at a depth of

24bits/sample.

5.3. SD Files (Legacy programmes only)

Coding Type

Format

Data Rate

Long GoP (inter coded):

2160p/25

200Mb/s

2160p/50

2500Mb/s

I-Frame (intra coded):

2160p/25

250Mb/s

2160p/50

500Mb/s

TECHNICAL SPECIFICATION FOR THE DELIVERY OF TELEVISION PROGRAMMES AS AS-11 FILES

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UK DPP File v5.0 - 2017

Channel 4 File v5.2 - 2022

Delivery of standard definition legacy programme files must be by agreement with the broadcaster.

Those files must meet the following requirements.

The programme must be delivered to the

AS-11 UK DPP SD

specifications that describe exactly

how the file must be constructed to meet DPP requirements. The SD file must contain the required

metadata.

5.3.1. SD Video Codec

The video essence in the file must be encoded at a nominal bitrate of 50Mbit/s using the SMPTE

ST 0356 D-10 stream specification. This is a constrained version of MPEG-2 4:2:2 P@ML. The

AS-11 UK DPP SD

specification gives full technical details of how the file should be constructed.

5.3.2. SD Audio

The audio must be frame interleaved with the video as described in the

AS-11 UK DPP SD

specification

All 8 audio tracks must be encoded as PCM in an AES3 stream with a sample rate of

48kHz at a depth of 24bits/sample.

5.4. Timecode

Timecode must be as specified in the

AS-11 UK DPP

specification. To ensure compatibility with

downstream systems it is very important that timecode is continuous and inserted in the file exactly

as specified.

5.5. Metadata

Metadata is the name for all the information which is not the audio or video essence, but which is

required to ensure that contents of the file can be identified correctly.

Descriptive metadata is usually added manually by the producer of the file. This includes

information which will be read by the users of the file in order to identify the material and use the

appropriate parts for further operations. It will include the titles and ID numbers for the programme,

and the allocations of the audio tracks present.

5.5.1. Delivery Requirements in MXF

Metadata within the principal MXF file must be as described by the

AS-11 UK DPP

specification

and must correctly reflect the material contained in the file.

Descriptive metadata must be included in the relevant metadata tracks within the file.

5.5.2. Metadata Completion

Examples of metadata required are in the

Metadata Supplement

TECHNICAL SPECIFICATION FOR THE DELIVERY OF TELEVISION PROGRAMMES AS AS-11 FILES

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UK DPP File v5.0 - 2017

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Part 3 – Channel 4 File delivery

6. Channel 4 File Requirements

This part of the document details Channel 4 contact, delivery information and any specific or genre

based technical requirements for AS-11 file delivered programmes.

6.1. Technical Responsibility and Contacts:

Channel 4 is required to ensure that for all broadcast programmes, technical quality is maintained

to a satisfactory standard. For any production or technical delivery enquiries, during office hours

please contact

Contact

Telephone

Broadcast Operations

broadcastoperations@channel4.co.uk

+44(0)2073 068391

If the delivery enquiry is related to transmission of a programme within 24hrs and your enquiry is

out of office hours, please contact the following:

Contact

Telephone

Duty Editor

dutyeditor@channel4.co.uk

+44(0)2073 068488

6.2. File Naming Requirements - PROGRAMMES

Programme files delivered to Channel 4 must be named thus:

Request Programme File Name

Format

Example Filename

Notes

XXXXX_YYY_Vnn.mxf

54321_004_V02.mxf

Contract Number (5 to 10 digits)_Episode Number(3 digits)_Version Number (3 digits). For

example, a file containing C4 Contract Number 54321, Episode Number 4, Version 2, would be

named as shown below.

Note that the “V” for Version must be uppercase and the extension names must be lowercase.

6.3. File Naming Requirements – QC reports

All reporting files will follow the same naming convention as the MXF programme files with the

report name as a further identifier after the underscore.

•

The PSE Report = _PSE

•

The AQC Report = _AQC

•

The Eyeball QC Report = _EYE

Some AQC devices combine the PSE and AQC reports and others allow manual entry for

comments from the Eyeball QC test. Broadcasters can accept all options as long as it is clear from

the file name what is included.

Quality Control (AQC, Eyeball QC and PSE) reports must be delivered as PDF reports and must

have the same Programme ID and Version Number as the programme file; as per below:

TECHNICAL SPECIFICATION FOR THE DELIVERY OF TELEVISION PROGRAMMES AS AS-11 FILES

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UK DPP File v5.0 - 2017

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Requested Report Name Format

Example Filename

Notes

XXXXX_YYY_Vnn_PSE.pdf

54321_004_V02_PSE.pdf

A PSE Report for that:

Programme (Contract) Number_

Episode Number_

Version Number_

PSE signifies PSE Report and it is in

PDF format.

XXXXX_YYY_Vnn_AQC.pdf

54321_004_V02_AQC.pdf

As above but for AQC

XXXXX_YYY_Vnn_EYE.pdf

54321_004_V02_EYE.pdf

As above but as an Eyeball test

XXXXX_YYY_Vnn_PSE_AQC.pdf

54321_004_V02_PSE_AQC.pdf

As above but in the case of combined

PSE and AQC reports

6.4. Channel 4 File Delivery Detail

The programme MXF and all the QC PDFs are delivered to a single upload area for you to drop

your files. Channel 4’s Programme Managers will give you the username and login for this, and

guidelines for naming the area for each delivery.

If you do not know who your programme manager is, they are all listed here:

http://www.channel4.com/info/commissioning/production-information/programme-management

6.5. Surround Audio Requirements

This is a supplement to

Section 2

and applies to all Channel 4 programmes that have Surround

Sound.

The stereo mix of a commissioned surround sound programme should be an automated down-mix

in Lo/Ro created from the 5.1 mix of the surround audio made using the down-mix metadata.

•

C4 prefers that all commissioned programmes with Surround Sound are provided with all

dialogue present in each of the three front channels (Mode 1).

•

Live, As-live, and Sports may be delivered as outlined in Mode 2. Out-of-vision

commentary or voice over that is placed in the centre channel only, should be

approximately 3LU higher than the in-vision dialogue in the front left and right channels

•

Where the international or co-production deliverables require a centre-only dialogue mix

(Mode 3) and it is not feasible to produce a Channel 4 UK transmission mix, then Centre-

only dialogue will be accepted.

The following table gives the settings required for delivery of C4 commissioned programmes.

PARAMETER

ALL COMMISSIONED CONTENT

SPORT AND LIVE PROGRAMMES

Dialogue Level*

-23dB

Line Mode Compression

Film Light

RF Mode Compression

Film Light

Centre Down Mix Level

Content Dependant*

-3dB

Surround Down Mix Level

Content Dependant*

-6dB

Surround 3dB Attn.

Disabled

Dolby Surround Mode

Disabled

Preferred Stereo Down Mix

LoRo

Surround Phase Shift

Disabled

*Although the target level for all programmes is -23dB, exceptions can be made for specific cases

agreed in advance

**The down mix parameter should be set to give the best balance for the genre or programme

style

6.6. Programme Layout Requirements

Whilst the standard DPP specification has clock/slate optional between hard parted content

segments, Channel 4 has made these mandatory for operational reasons. The document in

TECHNICAL SPECIFICATION FOR THE DELIVERY OF TELEVISION PROGRAMMES AS AS-11 FILES

Page 31 of 32

UK DPP File v5.0 - 2017

Channel 4 File v5.2 - 2022

sections 4.1 and 4.5 has been updated to reflect that the inclusion of a clock and the starting of the

subsequent at the next whole minute are not optional, and must be adhered to.

TECHNICAL SPECIFICATION FOR THE DELIVERY OF TELEVISION PROGRAMMES AS AS-11 FILES

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UK DPP File v5.0 - 2017

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Appendix A – Version Control

UK DPP FILE

CHANNEL 4 FILE

VERSION

DATE

PART AND

SECTION

REQUIRED /

INFORMATION

UPDATE

UK DPP V5.0

File

01/02/17

All

Required

DPP File New Version 5.0

See Change log

here.

VERSION

DATE

SECTION

REQUIRED /

INFORMATION

UPDATE

Channel 4

V5.0

File

25/09/17

All

Required

Channel 4 File New Version

Channel 4

v5.1 File

26/09/18

All

Required

Document updated with Channel 4 2018

corporate branding. No change to document

contents.

Channel 4

v5.2 File

06/06/22

All

Required

Modified section 4.1 and 4.5 to indicate that

clock/slate between hard parted

programmes is mandatory (not optional).

Addition of Section 6.6 to highlight this

broadcaster specific change.