title: use ffmpeg updated: 2015-10-10 11:12:14 description: Useful ffmpeg commands like speeding up video or boosting audio. os: [macosx, linux] tags: [ffmpeg] deps: [] contributors: ["http://www.github.com/anschwa"]
Helpful ffmpeg commands.
Speed video up 2x.
ffmpeg -i input.mkv -filter:v "setpts=0.5*PTS" output.mkv
Slow video down 2x
ffmpeg -i input.mkv -filter:v "setpts=2.0*PTS" output.mkv
ffmpeg -i input.mkv -i input.mp3 -c copy -shortest -map 0:0 -map 1:0 output.mkv
Boost audio by 150%
ffmpeg -g input.mp4 -af "volume=1.5" output.mp4