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Audio

In certain territories, Prime Video allows discrete audio file delivery containing localized dubs or descriptive audio of a program's content. For information on a territory-by-territory basis, see the Supported Features table. Each language requires delivery of a separate audio asset, and all assets must conform to the video mezzanine delivered for that title.

For titles previously delivered to the Global marketplace, content partners have the option to send discrete audio to enable additional languages. This is dependent on the original video being semi-textless. When delivering assets to accompany previously-delivered video mezzanines, all additional assets must use the same identifiers as the previously-delivered sources. If you require a low-resolution proxy file of the mezzanine previously delivered to Prime Video to conform audio or timed text in additional languages, contact your operations account manager.

Technical guidelines for audio files and audio channel mapping

A table of supported codecs and container types for alternate audio files is provided below. If your assets are saved in a format other than those listed below, it might be possible for Prime Video to accept these files as-is. Consult with your operations account manager to confirm compatibility of other asset types. Please only deliver fully-mixed program tracks. Additional tracks, like music and effects (M&E) and silent (MOS), must be removed prior to delivery.

Whenever available, 8-channel 5.1 Surround Sound + Stereo is preferred; however, audio files can support mono, stereo, 6-channel surround, and 8-channel surround sound + stereo mixes. 5.1 audio delivered without an accompanying stereo mix will automatically be down-mixed to stereo for customers without 5.1 audio capability. Audio assets must be mapped to one of the channel layouts in the table below.

All of the audio tracks contained in a package must be the same bit depth. For example, an 8-channel MPEG-2 TS with a 24-bit surround-sound track must also have a 24-bit stereo track. A 24-bit track and a 16-bit track embedded in the same asset will be rejected.

Audio validation

To minimize delivery of out-of-spec audio assets, manual or automated quality control testing can be performed on audio files prior to delivery. Some of the common issues are as follows:

  • One-hour offset in audio files
  • Too many audio channels
  • Too few audio channels
  • Mismatched video and audio durations
  • Non-standard sample rates
  • Long silent periods
  • Multiple languages across audio tracks
  • Non-program audio included in audio mixes. Music and Effects (M&E), MOS, silent tracks and commentary tracks must be removed.

Audio Codec

PCM (LPCM)

MPEG-2 Layer II

AC-3

AAC

Applies to video format

ProRes 422 or MEPG-2

MPEG-2

H.264 or MPEG-2

Minimum Bit Rate

Loseless

ST: 384k
5.1: 912k

ST: 192k
5.1: 448k

ST: 448k
5.1: 960k

Sample Rate

48 kHz

Bit Depth

16-bit, 24-bit

1-channel Layout

Mono mix

2-channel Layout

Stereo Mix mapped as follows: L-R or Dual-Mono

6-channel Layout

5.1 mix mapped as follows: L-R-C-LFE-LS-RS

8-channel Layout

5.1+Stereo total mapped as follows: L-R-C-LFE-LS-RS-stereoL-stereoR

Descriptive audio

In our effort to further support blind and visually impaired customers, Prime Video fully supports descriptive audio or "narration." Descriptive audio consists of a narrator talking through the presentation, describing what is happening on the screen or stage during the natural pauses in the audio, and sometimes during dialogue if deemed necessary.

To deliver descriptive audio, content partners must adhere to the following instructions, depending on delivery method:

Audio in Prime Video Simple Asset Manifest

Audio in File Name Convention

Audio in Media Manifest Core (MMC)


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