Miscellaneous FFmpeg scripts

misc-ffmpeg.bash

# record lossless video to screengrab.mp4 after waiting 5 seconds, override without asking
sleep 5 && \
  ffmpeg -y -video_size 1920x1080 -framerate 25 -f x11grab -i $DISPLAY -c:v libx264 -crf 0 -preset ultrafast screengrab.mp4

# lossless encoding of screengrab.mp4 with high quality, no audio ("-an", instead of "-c:a copy")
# CRF: "For x264, sane values are between 18 and 28. The default is 23"
# from start to 2 minutes
ffmpeg -ss 00:00:00 -i screengrab.mp4 -t 00:02:00 -c:v libx264 -preset slow -crf 22 -an output.mp4

# change video container without re-encoding
ffmpeg -i video.mkv -codec copy video.mp4