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# ffmpeg tricks
## Cut
ffmpeg -i in.mp4 -codec:v copy -codec:a copy -ss START_TIME -t DURATION out.mp4
ffmpeg -ss START_TIME -t DURATION -i in.mp4 -codec:v copy -codec:a copy out.mp4
## Resize
ffmpeg -i in.mp4 -s 720x480 out.mp4
# -1 means to automatically preserve aspect ratio
ffmpeg -i in.mp4 -filter:v scale=720:-1 out.mp4
## Rotate
# 90 degrees clockwise
ffmpeg -i in.mov -vf "transpose=1" out.mov
# 180 degrees
ffmpeg -vf "transpose=2,transpose=2"
For the transpose parameter you can pass:
0 = 90CounterCLockwise and Vertical Flip (default)
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip
## Record screen
ffmpeg -f x11grab -s 1920x1080 -i :0.0 out.mkv
## Record from webcam
ffmpeg -i /dev/video0 out.mkv
## Record sound
ffmpeg -f alsa -i default out.flac
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