Useful FFmpeg Commands

FFmpeg is a great command-line tool for dealing with audio and video files. Here are a couple of useful commands:

Extract audio from a video

$ ffmpeg -i video.mp4 -q:a 0 -map a audio.mp3

Concatenate multiple videos into a single file

First, create a file containing the list of videos to concatenate, and then pass it through ffmpeg:

$ cat list.txt
file '/path/to/file1.mp4'
file '/path/to/file2.mp4'
file '/path/to/file3.mp4'

$ ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4

Related post:
FFmpeg Cheatsheet