On 06/05/2013 10:42 AM, Atte André Jensen wrote: Recently, the only effective way I've found to do screen recording with jack is using ffmpeg - yet this must be the 'original' ffmpeg not libav which is now packaged e.g. in Debian, which I couldn't get to work with jack - And this needs to be compiled by hand on debian [1] This is the script I use (adapted from someone else (TM) I found online): ffmpeg -f jack -ac 2 -i ffmpeg -f x11grab -r 30 -s 1280x800 -i :0.0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast -threads 0 output.avi Advantages: - it works well (with jack) - very good quality - good audio/video sync Disadvantages: - you have to manually calculate the screen size and rectangle (-s and -i switches) - you need to connect your jack output(s) to the ffmpeg jack input after you've started recording - fairly big output file For the last 'drawback' you can convert to a compressed video format such as webm. Recently I am use (again stolen, ehm, inspired from some online forum [2]): ffmpeg -y -i "$INFILE" -threads 8 -f webm -vcodec libvpx -g 120 -level 216 -profile 0 -qmax 42 -qmin 10 -rc_buf_aggressivity 0.95 -vb 2M -acodec libvorbis -aq 90 -ac 2 $OUTFILE This will give a nice webm video which is about 20% the filesize of the original avi Here is a quick short example of the final output: http://gnufunk.org/~lorenzosu/temp/ffmpeg_grab_test.webm Hope this helps Lorenzo. PS This (longer) was also created with the same technique: http://vimeo.com/36609964 [1] I succeed on Debian wheezy amd64 following this: https://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide [2] I actually found the source for this: http://ubuntuforums.org/showthread.php?t=1522381&p=9539218#post9539218 - thanks demizer