- not everyone uses subtitles
Yeah, I've found that out in the three years that I've been working on this problem. What I want to do is quite simple and straightforward, so I'm still surprised so few people do this: you have a subtitled MKV file with a subtitle file inside it. You want to make a clip from a small portion of the video, while also keeping the subtitles. You can't simply use the subtitle file because the timing of, say, a 1-minute video will run from 0:00:00 to 0:01:00, but the minute you clipped is from the middle of the video. In that case, the subtitle file will not contain the correct timing. I realize I can use a subtitling program to adjust the timing of the extracted subtitles, but that turns out to be quite a lot of work to get it just right and embed the clipped subtitle file in the video. Clipping with avidemux makes it a no-brainer, as long as you can use the subtitle filter. That has the disadvantage of hardcoding the subtitles, but that doesn't matter in my case for the short clips because the original full-length video contains the editable subtitle file. I need to make about 50 short clips per video, so using the subtitle filter saves me a lot of work over any other method. You would think there'd be other people who make short clips from long, subtitled videos, but apparently not. I've tried to get other colleagues to use this method, but they're technology-challenged and so they minimize their use of clips (when they shouldn't) and end up fumbling around when doing presentations. In my case, I pre-make all my clips and have them all lined up so that I'm not searching back and forth for the right spot in a video to show.
I think lots of people make clips from long videos; the need to subtitle is much less encountered, but I *must* preserve the original subtitles.