ffmpeg -ss $START -i "$INPUT" -t $DURATION -c copy "trimmed_fast.mkv"
(e.g., converting a surveillance or legal video with English subtitles, starting from the 2 hour, 0 minute, 6 second mark). jur153engsub convert020006 min
The subtitles remain a separate track within the file. This allows the viewer to toggle them, but they can sometimes be lost if the conversion software isn't configured correctly. ffmpeg -ss $START -i "$INPUT" -t $DURATION -c
So the full instruction might be: