#9105: Cannot set dispositions for subtitle streams inside MKV other than
Default
and Forced
-------------------------------------+-------------------------------------
Reporter: droid-xx | Type: defect
Status: new | Priority: normal
Component: ffmpeg | Version:
Keywords: ffmpeg | unspecified
disposition metadata | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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I'm not sure whether this is a bug or a feature but I'm filing this since
the documentation on disposition types is lacking details.
If this is a feature, then there's probably some internal checking by
ffmpeg to determine whether the disposition type given by the user can be
applied to the selected stream. So obviously if you pass a disposition
type of "attached_pic" to a subtitle it won't make any sense, hence
nothing will change in the output disposition-wise (although there's no
error or warning displayed to inform the user about this, and the
documentation doesn't state which dispositions apply to which types of
streams).
However there are at least 2 more dispositions that can be set for
subtitle streams: "karaoke" (for ass/ssa which are designed as karaoke
subtitles) and "hearing_impaired" (for SDH subtitles).
This works for the third subtitle track inside an .mkv with a total of 3
subtitle streams:
{{{
ffmpeg -i input.mkv -map 0 -c copy -disposition:s:2 forced output.mkv
}}}
This won't work (disposition is ignored with no errors/warnings):
{{{
ffmpeg -i input.mkv -map 0 -c copy -disposition:s:2 hearing_impaired
output.mkv
}}}
{{{
ffmpeg -i input.mkv -map 0 -c copy -disposition:s:2 karaoke output.mkv
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9105>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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