> Digital Cinema Naming Convention and Metadata/Terminology Registries > Naming Convention > Audio Config and Narrative Description Tracks

Many DCPs now contain supplementary tracks with an assisted listening track (enhanced dialog), and/or supplementary audio description tracks. In addition, sign language video may also be present, contained in an audio track. The presence of these tracks should be indicated in the Audio Type field as follows:

IAB-HI-VI-DBOX-51 = IAB audio with both Assisted Listening and Audio Description tracks, DBox Motion Control, and 5.1 audio "fallback" in MainSound
IAB-HI-VI-DBOX = IAB audio with both Assisted Listening and Audio Description tracks, DBox Motion Control, and no "fallback" audio in MainSound (preferred as per SMPTE ST 429-19)
51-HI = 5.1 audio with a supplemental Assisted Listening track.
51-VI = 5.1 audio with a supplemental Audio Description track.
51-VI-SL = 5.1 audio with both supplemental Audio Description Description and Sign Language tracks.
51-HI-VI = 5.1 audio with both Assisted Listening and Audio Description tracks.
51-HI-VI-SL = 5.1 audio with Assisted Listening, Audio Description and Sign Language tracks.

The Audio Configuration is listed at //Reel[1]//CompositionMetadataAsset/MainSoundConfiguration[1][2][3][4]

<CompositionMetadataAsset xmlns=”http://www.smpte-ra.org/schemas/429-16/2014/CPL-Metadata”>
  …
  <MainSoundConfiguration>71/L,R,C,LFE,Lss,Rss,HI,VIN,-,-,Lrs,Rrs,-,-,-,-</MainSoundConfiguration>
  …
</CompositionMetadataAsset>

  1. The syntax for the Sound Configuration value includes qualifiers not shown in the example above; see SMPTE ST 429-16-2014 for details. ↩︎

  2. Permissible values for the SOUNDFIELD component of MainSoundConfiguration include the following listed in SMPTE ST 428-12: 51, 71, SDS, M. ↩︎

  3. For silent compositions, either omit the MainSoundConfiguration element or append /- to the SOUNDFIELD, e.g. 71/-. ↩︎

  4. The MainSoundConfiguration element is a logical extension of the MainSound element in the composition playlist (the latter is a required element). ↩︎

Special Note: It is important to note that there is not a specific language indicated in the Audio Type field for the HI, VI or SL tracks, since most often this language will be the same as the language indicated earlier in the naming string in the Audio Language field.