On 15-02-2025 13:25, mb...@mbork.pl wrote:
Hi all,
I have a video with subtitles (as an srt file). I want to clip
a fragment from it, scaling it down to a worse resolution, _and_ put the
subtitles in the resulting clip.
This is how I do it now:
time ffmpeg -y -i some_film.mp4 -ss 121052ms -to 140392ms -c:v libx264 -c:a
copy -vf subtitles=some_film.srt -vf scale=240:-1 clip.mp4
However, this "burns the subtitles into the video", and I'd prefer to
have them as a separate track. I tried this:
time ffmpeg -y -i some_film.mp4 -i some_film.srt -ss 121052ms -to 140392ms -c:v
libx264 -vf scale=240:-1 -c:a copy -c:s mov_text clip.mp4
but it didn't work - the clip was selected correctly, the resolution was
correct, but I couldn't see the subtitles.
What am I doing wrong?
Thanks in advance,
FFmpeg does not write subtitle files as far as i know.
But as an .SRT file is just plain text, you can just edit the content
with a simple text editor to match your clip, all you have to do is
remove the lines that are not in your clip and adjust the numbers and
timestamps of the lines that are left. Depending on the length it might
be possible to script this, but for a short clip it could be done by
hand quicker than scripting it.
Alternatively you can convert your srt input, mp4 only supports one type
of subtitle stream, so you will have to convert your srt input to
mov_text, remove the subtitle filter and add -c:s mov_text
Or switch to another container like mkv, that does support srt subtitle
streams, remove the subtitle filter and add -c:s copy
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