FFMPEG cheatsheet

ffmpeg cheatsheet.md

Speed up or slow down

ffmpeg -r 10 -i speed2.mp4 -filter:v "setpts=0.1*PTS" -r 60 out.speed2.mp4

-r Specifies the framerates of the video files
-filter:v "setpts=0.1*PTS" Specifies that the output video is 10 times faster than the original

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Blur video

ffmpeg -i intro_raw.mkv -filter_complex "boxblur=20:2" intro_blured_2.mkv

Docs

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Slice video

ffmpeg -i input.mp4 -ss <startTimeInSeconds> -t <durationInSeconds> -c copy output.mp4

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Attach multiple videos

1. Create a text file with all seperate files like this

inputs.txt

file 'cut.out.speed1.mp4'
file 'cut.out.speed2.mp4'

2. Execute command

ffmpeg -f concat -i inputs.txt -c copy outfinal.mp4

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Extract specific audio track from video

ffmpeg -i test.mp4 -map 0:2:a -vn -c copy audio_mic.aac

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Merge audio tracks in video

ffmpeg -i test.mp4 -i audio_mic.mp3 -filter_complex amerge -map 0:a:0 -map 0:v:0 merged.mp4

Extract Alpha Layer from Video

ffmpeg -i INTRO.avi -vf alphaextract,format=yuv420p INTRO_alpha.mp4

Normalize Audio

ffmpeg -i ./oof.mp3 -af loudnorm=I=-16:TP=-0.3:LRA=11 ./normalized/oof.mp3

Receive RTMP Stream From OBS, for exmaple

ffplay -fflags nobuffer -listen 1935 rtmp://0.0.0.0