ffmpeg -i input.mp3 output.m4a
2. Merging audio and video
- Can change final container (mkv is most versatile), ffmpeg automatically decides the decoders for the job.
ffmpeg -i audio.mp3 -i video.mp4 -c copy merged_video.mkv
ffmpeg -i input.avi -sameq output.mkv
4. Convert only first 30 seconds (-t)
ffmpeg -i aadat.mp3 -t 30 aadatintro.mp3
-t also supports hh:mm:ss as time format- Variation of this can be used to cut a part of the video,
-ss flag sets the start time. So set the start time with -ss and duration with -t
ffmpeg -i aadat.mp3 -ss 1:12 -t 1:00 solo.mp3
5. Strip audio or video
-an removes audio and -vn strips video
ffmpeg -i video.mp4 -vn audio.mp3
6. Bitrate
-ab sets the audio bitrate and -b sets the video bitrate explicitly
ffmpeg -i audio.mp3 -ab 128k audiocompressed.mp3
Notes
- default bitrate for video is 200kbps and 64 kbps for audio
- ffmpeg options are always applied to next file in argument list, can be input or ouput file.
- RTFM for more