#9105: Cannot set dispositions for subtitle streams inside MKV other than
Default
and Forced
-------------------------------------+-------------------------------------
Reporter: droid-xx | Owner:
Type: defect | Status: new
Priority: normal | Component: ffmpeg
Version: unspecified | Resolution:
Keywords: ffmpeg | Blocked By:
disposition metadata |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by mkver):
There are no internal checks whether a disposition can be applied at all;
instead most muxers just don't check the disposition at all, because the
format either does have anything that one can map these dispositions to or
because doing so is just unimplemented. And if a muxer supports a specific
disposition flag, it only checks for whether this flag is set or not and
ignores all the others.
The Matroska muxer is one of the few muxers that preserve some
dispositions. But it can only preserve those dispositions for which there
is a matching Matroska element. This is not so for karaoke and up until
[https://github.com/ietf-wg-cellar/matroska-
specification/commit/0e330fded85654d637c256797ea9cc6bfb79fde3 very
recently] it was also not true for hearing_impaired. I have just sent a
[https://ffmpeg.org/pipermail/ffmpeg-devel/2021-February/276322.html
patchset] that implements support for hearing_impaired and a few other
dispositions that Matroska now supports.
Matroska always allowed to preserve the attached_pic disposition (for
video streams only); it is just unimplemented. I need to finally
[https://github.com/mkver/FFmpeg/commit/f7f5ae9e4b65b7adcdffc63e915c47509088a6ea
finish this].
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9105#comment:2>
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