[FFmpeg-trac] #2402(FFmpeg:open): FFmpeg marks no subtitles in mkv files as default
FFmpeg
trac at avcodec.org
Mon Mar 25 21:58:12 CET 2013
#2402: FFmpeg marks no subtitles in mkv files as default
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Reporter: someuser | Owner:
Type: enhancement | Status: open
Priority: wish | Component: FFmpeg
Version: git-master | Resolution:
Keywords: mkv | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 1 |
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Comment (by someuser):
Replying to [comment:1 cehoyos]:
> None of your input subtitle streams is marked as default, current FFmpeg
therefore does not write the default flag for any of the subtitle tracks.
The Matroska specification -
http://matroska.org/technical/specs/index.html (search for FlagDefault) -
specifies that the value for the default flag is "default" if nothing is
specified, the demuxer therefore marks all subtitle tracks as "default".
Ok, thanks for this background information, I was looking at the above
output and saw '''DISPOSITION:default=1''' and also in ''ffmpeg -i
test.mkv'' output there is:
{{{
Stream #0:2(eng): Subtitle: subrip (default)
Stream #0:3(fra): Subtitle: subrip (default)
}}}
> What is missing afaict is a possibility for the user to mark streams as
default streams, an alternative is to always set the first stream as
default in the Matroska muxer, I am not completely convinced that this is
the best solution,
For me as a user the ability to mark streams as default streams sounds
like an ideal solution, although forcing the first one being the default
one would be ok'ish, too.
> consider sending a patch if that is what you want.
I am a user unfortunately not a developer so I tried to do my best with
home work wrt googling, reading documents, checking for duplicate tickets,
etc and since I couldn't find any clear answers I wanted to file this
ticket to serve as a note for other users and developers alike.
Thanks.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2402#comment:3>
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