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### Useful ffmpeg commands ### |
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Here I keep the few ffmpeg commands that I need from time to time to process vi… |
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=== extract audio from a video === |
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ffmpeg -i 20180217_103328.mp4 -vn -acodec copy 20180217_103328-audio.aac |
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=== remove audio from a video === |
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ffmpeg -i 20180217_103328.mp4 -vcodec copy -an 20180217_103328-noaudio.mp4 |
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=== mix audio+video === |
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ffmpeg -i 20180217_103328-noaudio.mp4 -i 20180217_103328-audio2.aac 20180217_10… |
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=== modify start time and duration === |
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ffmpeg -i source.mp4 -ss 00:00:05 -t 00:00:10 -c copy cut_video.mp4 |
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=== re-encode a video === |
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ffmpeg -i source.mp4 dest.mp4 |
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=== convert mp4 to gif (rescale to 640x480 and lower framerate to 10hz) === |
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ffmpeg -i source.mp4 -s 640x480 -r 10 funnycat.gif |
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=== apply several video filters: rotate by 90 degrees and crop video === |
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ffmpeg -i source.mp4 -filter:v "transpose=3, crop=720:1000:0:0" newvideo.mp4 |
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=== slow down or accelerate a video by x1.5 === |
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ffmpeg -i source -filter:v "setpts=1.5*PTS" slow.mp4 |
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ffmpeg -i source -filter:v "setpts=0.5*PTS" fast.mp4 |
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