Screencast with Linux
ffmpeg -f x11grab -video_size 1366x768 -i $DISPLAY -f alsa -i default -c:v libx264 video.mp4
Adjust the video size to your screen resolution for best quality.
Cutting the video
Use Pitivi, OpenShot or another GUI program.
Command line
Can be faster, as it does not need to re-encode
Cutting
ffmpeg -ss 00:08:00 -i video.mp4 -ss 00:01:00 -t 00:01:00 -c copy videocut.mp4
The first
-ssseeks fast to (approximately) 8min0sec, and then the second-ssseeks accurately to 9min0sec, and the-t 00:01:00takes out a 1min0sec clip.
https://superuser.com/questions/138331/using-ffmpeg-to-cut-up-video
Use -to instead of -t to seek to absolute time values.
ffmpeg -ss 00:08:00 -i video.mp4 -ss 00:01:00 -to 00:10:00 -c copy videocut.mp4
Joining videos
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