[Matroska-devel] [Cellar] Depth offsets for subtitles in case of 3D MVC tracks in MKV files

madshi via Matroska-devel matroska-devel at lists.matroska.org
Tue Jan 26 14:16:39 CET 2016

2016-01-26 13:34 GMT+01:00 Steve Lhomme via Matroska-devel
<matroska-devel at lists.matroska.org>:
> I'm not sure I understand. Is the offset per track or per frame for
> the subtitle ? If it's per track it should go in the Track Info. If
> not that means a mechanism to add that information for each frame.
> Maybe BlockGroup could help.

The 3D Blu-Ray spec says:

> P. Offset metadata
> The offset_metadata() shall be stored in the user data container
> (defined in which is contained in MVC scalable nesting
> SEI message of the first view component of each GOP of MPEG-4
> MVC Dependent view video stream in decoding order.

I'm not a big expert on these things, but doesn't that mean it's part
of the MVC video bitstream? In that case there's probably no need to
store it in separate MKV fields/properties?

Best regards, Mathias.

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