Audio Configuration and Narrative Description Track Language
The first two characters denote the soundtrack configuration:
51 = 5.1
71 = 7.1 (Verify channel configuration with content provider.)
10 = 1.0 (Center Channel Mono)
20 = 2.0 (Stereo) Note: Only discrete audio should be used in a DCP; matrixed audio, such as Lt/Rt, should not be used.
MOS = No audio (Silent)
In the Composition Playlist
The Audio Configuration is listed at //Reel//CompositionMetadataAsset/MainSoundConfiguration:
1) The syntax for the Sound Configuration value includes qualifiers not shown in the example above; see SMPTE 429-16-2014 for details.
2) Permissible values for the SOUNDFIELD component of MainSoundConfiguration include the following listed in SMPTE 428-12: "51", "71", "SDS", "61", "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).
Many DCPs now contain supplementary tracks for hearing impaired patrons, or / and supplementary narrative description tracks for vision impaired patrons. The presence of these tracks should be indicated in the Audio Type field as follows:
51-HI = 5.1 audio with a supplemental Hearing Impaired track.
51-VI = 5.1 audio with a supplemental Vision Impaired Narrative Description track.
51-HI-VI = 51 audio with both Hearing Impaired and Vision Impaired Narrative Description tracks.
It is important to note that there is no longer a specific language indicated in the Audio Type field for the HI or VI tracks, since most often this language will be the same as the language indicated earlier in the naming string in the Audio Language field.
If the DCP contains immersive sound formats such as Atmos, Auro or DTS-X, name the formats in a sub-field after HI and/or VI. For example:
If the DCP contains a motion simulator format such as D-Box, name the format in a sub-field after everything else. For example: