[npteljes]

Another one I used to merge subtitles into their respective mkv video files:

    find . -name "*.mkv" -exec ffmpeg -i "{}" -i "{}.srt" -map 0 -map 1 -c copy "{}_merged.mkv" \;

[cyphar]

No hate on ffmpeg but you can do this with mkvmerge as well.

[npteljes]

Quite a nice syntax too:

    mkvmerge -o out.mkv in.avi in.srt

Thanks for the recommendation.