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FFMPEG

FFMPEG is a FOSS for encoding audio and video: https://www.ffmpeg.org/

Audio​

Re-encode .mp3 audio file as .wav​

ffmpeg -i someaudiofile.mp3 someaudiofile.wav

Video​

Re-encode to .mp4​

ffmpeg -i input.MP4 output.mp4

Rotate video​

Rotate 90 clockwise:

ffmpeg -i in.mov -vf "transpose=1" out.mov For the transpose parameter you can pass:

0 = 90° counterclockwise and vertical flip (default)
1 = 90° clockwise
2 = 90° counterclockwise
3 = 90° clockwise and vertical flip

Use -vf "transpose=2,transpose=2" for 180 degrees.

src: https://stackoverflow.com/a/9570992

Crop video​

ffmpeg -i input.mp4 -filter:v "crop=w:h:x:y" output.mp4 - replace crop=w:h:x:y with something like crop=1920:1080:0:0

Gif​

Convert video to gif​

Scale down 1080p video into 1/4: ffmpeg -i "input-video.mkv" -s 960x540 output.gif

Add audio over video​

ffmpeg -i input-video.mp4 -i audio-overlay.mp3 -filter_complex "[0:a][1:a]amix=inputs=2:weights=1 .5[aout]" -map 0:v -map "[aout]" -c:v copy -shortest output-video-with-audio.mp4

  • weights=1 .5 uses 100% volume for the original video, 50% volume for the overlay