ffmpeg

Setup ffmpeg. See also Arch Wiki: ffmpeg

Install

Ubuntu

sudo apt install ffmpeg

Windows

choco install ffmpeg

Or

winget install Gyan.FFmpeg

Usage

Simple stream copy

To rebuild “99.9% complete” videos without re-encoding.

ffmpeg -i input.mkv -c copy -o output.mkv

Remove audio without re-encoding video

ffmpeg -i in.mp4 -c:v copy -an out.mp4

ffmpeg -i input-video.avi -vn -c:a copy output-audio.aac

Options explained:

• -vn : no video output.
• -an : no audio output.
• -{a,v}codec copy: copy without re-encoding.

Cutting videos

Without re-encoding, just simple copying as-is:

ffmpeg -ss 00:01:00 -i input.mp4 -t 00:01:00 -c copy output.mp4

With re-encoding, slower but more frame accurate:

ffmpeg -ss 00:00:03 -i input.mp4 -t 00:00:08 -async 1 output.mp4

Options explained:

• -ss for seeking to starting time hh:mm:ss.
• -t for the duration of hh:mm:ss, or -to for the end time hh:mm:ss.