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Old 6th December 2018, 10:28   #1  |  Link
unknownsoldierX
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Join Date: Jun 2005
Posts: 236
How do I use ffmpeg forced_subs_only option?

Windows 7x64

I just discovered the ffmpeg option "-forced_subs_only 1" and I can't get it to work.

Code:
for %%f in ("*.mkv") do %ffmpeg% -forced_subs_only 1 -i "%%f" -map 0:s:0 "%%~nf.srt"
Still extracts all subtitles, flagged forced or not.

Code:
for %%f in ("*.mkv") do %ffmpeg% -i "%%f" -map 0:s:0 -forced_subs_only 1 "%%~nf.srt"
Doesn't extract anything, just gives this message:

Codec AVOption forced_subs_only (Only show forced subtitles) specified for output file #0 (movie.srt)
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Old 6th December 2018, 10:40   #2  |  Link
sneaker_ger
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Posts: 5,142
There are no forced flags (per line) for srt subtitles. That is something you find on DVD or Blu-Ray subtitles.
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Old 6th December 2018, 10:48   #3  |  Link
unknownsoldierX
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Join Date: Jun 2005
Posts: 236
Ok. I misunderstood the purpose of that command.

When I look at an mp4 or mkv using something like mediainfo, it shows the subtitle streams and sometimes it says they are forced. Is there a way to extract only subtitle streams that have that flag set?

edit: It looks like what I want to do is extract subtitles based on disposition, but so far I can't see any mention of being able to do that with ffmpeg.

Last edited by unknownsoldierX; 6th December 2018 at 10:54.
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Old 8th December 2018, 23:50   #4  |  Link
kuchikirukia
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Join Date: Oct 2014
Posts: 401
I don't think you can do it with gMKVExtract GUI either, but if they all have the same name or language you can do it that way.
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