====== Record Desktop ======

ffmpeg can be used to record the desktop.

    ffmpeg -f x11grab -s wxga -r 15 -i :0.0 -qscale 5  out.avi

''wxga'' specifies the resolugion 1366 x 768.

ffmpeg also supports cutting the video:

    ffmpeg -i out.avi -ss 4 -t 00:02:07.0 -vcodec copy cut.avi

The parameter ''ss'' skips the first x seconds. The parameter ''t'' specifies the duration in the format ''HH:MM:SS.sss''.

Converting the video from avi to mpeg:

    ffmpeg -i cut.avi -vcodec libx264 -preset veryslow -crf 0 transcoded.mp4 

Slow down or speed up recording:

    mencoder -ovc copy -oac copy -speed .5 transcoded.mp4 -o transcoded-slow.mp4



    ffmpeg -i transcoded.mp4 -vf setpts=2*PTS -an transcoded-slow.mp4

Adding subtitle:

    ffmpeg -i subtitle.srt subtitle.ass


    ffmpeg -i transcoded-slow.mp4 -vf "ass=subtitle.ass" out.avi

{{tag> linux}}