when I say trim I don’t mean to time trim a file, like getting rid of the last 2 minutes of the mkv file, but to picture trim every frame of the mkv file to get rid of black margins to both left and right of the actual image.
Files were originally recorded on 4:3 aspect ratio (some are movies from the 1950’s) but the encoder somehow created / copied huge black margins to both left and right of the actual image. I want to get rid of these.
Some of my files are 30 minutes long but others 2 hours.
if ffmpeg is the application I need, could anyone knowledgeable enough write the actual command?
can it be done for several files automatically?
MKVToolNix has a great cropping feature that completely lossless because it just writes an information into the file how many pixels to leave out.
The massive problem since quite some time is that I’m not aware of any media player respecting this. VLC used to support it but a decade ago suddenly stopped: https://code.videolan.org/videolan/vlc/-/issues/13982
If you have the originals, maybe encode them again. HandBrake has a nice preview feature.
mpv still works.