> 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.

# DCNC Code
(For CTT)		 Description MCATagSymbol Value
(For DCP Metadata)		 MainSoundConfiguration Tag
(For DCP Metadata)		 CompositionMetadataAsset Extension
(For DCP Metadata)		 Metadata Defining Document(s) Notes
1 51 5.1 sg51 51 [SMPTE ST 429-16:2014]
[SMPTE ST 429-2:2020]
[SMPTE ST 428-12:2013]
2 71 7.1 sg71 71 [SMPTE ST 429-16:2014]
[SMPTE ST 429-2:2020]
[SMPTE ST 428-12:2013]
3 10 1.0 (Center Channel Mono) sgM M [SMPTE ST 429-16:2014]
[SMPTE ST 429-2:2020]
[SMPTE ST 428-12:2013]
4 20 2.0 (Stereo) Only discrete audio should be used in a DCP; matrixed audio, such as Lt/Rt, should not be used.
5 21 2.1 (Stereo with Sub)
6 MOS No audio (Silent) - [SMPTE ST 429-16:2014]
7 IAB Immersive Audio Bitstream (SMPTE ST2098-2) Profile 1 <cpl-meta:ExtensionMetadata scope="http://isdcf.com/ns/cplmd/app">
  <cpl-meta:Name>Application</cpl-meta:Name>
  <cpl-meta:PropertyList>
    <cpl-meta:Property>
      <cpl-meta:Name>IAB Profile</cpl-meta:Name>
      <cpl-meta:Value>SMPTE-ST-2098-2:2019-P1</cpl-meta:Value>
    </cpl-meta:Property>
  </cpl-meta:PropertyList>
</cpl-meta:ExtensionMetadata> 		[SMPTE RDD 57:2021]
8 HI Assisted Listening Track sgHI HI [SMPTE ST 429-16:2014]
[SMPTE ST 429-2:2020]
[SMPTE ST 428-12:2013]
9 VI Audio Description Track sgVIN VIN [SMPTE ST 429-16:2014]
[SMPTE ST 429-2:2020]
[SMPTE ST 428-12:2013]
10 SL Sign Language Track SLVS SLVS <cpl-meta:ExtensionMetadata scope="http://isdcf.com/2017/10/SignLanguageVideo">
  <cpl-meta:Name>Sign Language Video</cpl-meta:Name>
  <cpl-meta:PropertyList>
    <cpl-meta:Property>
      <cpl-meta:Name>Language Tag</cpl-meta:Name>
      <cpl-meta:Value>[Language]</cpl-meta:Value>
    </cpl-meta:Property>
  </cpl-meta:PropertyList>
</cpl-meta:ExtensionMetadata> 		[ISDCF Doc 13] Where [DESCRIPTION] is a Language-Tag, as specified in IETF RFC 5646, that identifies the sign language present in the Sign Language Video Track
11 ATMOS Dolby ATMOS Immersive Audio Deprecated. The IAB code should be used instead.
12 AURO Barco AURO Immersive Audio
13 DTSX DTS:X Immersive Audio
14 DBOX DBox Motion Control DBOX DBOX <cpl-meta:ExtensionMetadata scope="http://www.d-box.com/technical_notes/124-915-0005">
  <cpl-meta:Name>D-BOX Enabled</cpl-meta:Name>
  <cpl-meta:PropertyList>
    <cpl-meta:Property>
      <cpl-meta:Name>D-BOX Motion Code Primary Stream</cpl-meta:Name>
      <cpl-meta:Value>true</cpl-meta:Value>
    </cpl-meta:Property>
  </cpl-meta:PropertyList>
</cpl-meta:ExtensionMetadata> 		[DBOX Technical Note 124-915-0005-A02]