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Add subtitle->audio track linking #471
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Original file line number | Diff line number | Diff line change |
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@@ -327,6 +327,27 @@ Overlay tracks **SHOULD** be rendered in the same channel as the track its linke | |
When content is found in such a track, it **SHOULD** be played on the rendering channel | ||
instead of the original track. | ||
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## Track Links | ||
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A track link indicates that a given subtitle track is suitable for use with a given audio track, | ||
and that it **SHOULD** be eligible for autoselection when that audio track is selected. | ||
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For instance: | ||
- A subtitle track containing a translation of an audio track in another language should be | ||
linked to that track, but should not be linked to another audio track featuring a dub | ||
into the same language with a different translation. | ||
A subtitle track containing a transcription of the dub, if present, should be linked to the dub audio track. | ||
- A forced subtitle track containing onscreen text consistent with the dialogue in an audio track | ||
of the same language should be linked to that track, but should not be linked to another audio track | ||
featuring a different translation into the same language. | ||
- A subtitle track containing a transcription of an audio commentary track should be linked to | ||
that audio commentary track, but not to other tracks featuring separate commentary recordings. | ||
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Track links are only necessary when the set of tracks available creates ambiguity about which | ||
subtitles are appropriate for which audio, and function as a hint to the player to improve | ||
its automatic track selection behavior. In cases where there is no such ambiguity, there is | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. There should be a link to the |
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no need to explicitly specify track links. | ||
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## Multi-planar and 3D videos | ||
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There are two different ways to compress 3D videos: have each eye track in a separate track | ||
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It should mention that the TrackEntry it belongs to
**MUST**
be a subtitle track, in a normative way.