Today I was using ffmpeg to trim an ear from an mkv and realized that the command I left above is not working. For trimming a batch of videos with visual feedback there’s nothing that comes close to the speed of mpv with either excerpt (better one IMO) or slicing scripts. A bit cumbersome but ffmpeg’s comand working ( 4 me) to cut a slice of a video file:
ffmpeg -ss 00:08:00 -i INPUT -ss 00:01:00 -t 00:01:00 -c copy OUTPUT
seriesoftubes user explains it well
The first -ss seeks fast to (approximately) 8min0sec, and then the second -ss seeks accurately to 9min0sec, and the -t 00:01:00 takes out a 1min0sec clip.
And a warning
If you use -ss with -c:v copy, the resulting bitstream might end up being choppy, not playable, or out of sync with the audio stream, since ffmpeg is forced to only use/split on i-frames.