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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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can I trim the black margins of several mkv files on debian 12.11 with ffmpeg or mkvtoolnix? (lemmy.ml)

submitted 3 weeks ago* (last edited 3 weeks ago) by [email protected] to c/[email protected]

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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?

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[–] [email protected] 1 points 3 weeks ago (1 children)

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.

[–] [email protected] 2 points 3 weeks ago

mpv still works.