Desktop record using ffmpeg
UBUNTU 18.04 LTS ffmpeg -video_size 1920x1080 -framerate 20 -f x11grab -i :0.0 -f pulse -ac 2 -i default output.mp4
- r = frame rate (se poate varia... 10...30... de testat) la 20 mi s-a parut ok.... la 10 mi s-a parut ca se misca cam sacadat mouse-ul....
https://trac.ffmpeg.org/wiki/Capture/Desktop
concatenate 2 mp4 files. f
fmpeg -f concat -safe 0 -i mylist.txt -c copy outputx.mp4
unde mylist.txt este
file '/path/to/file1.mp4'
file /path/to/file2.mp4'