I'm using the script below to run FFmpeg on Ubuntu 10.10. I followed these instructions to install FFmpeg & x264.

While ffmpeg does capture the screen it does not capture the mic audio. I've checked that the mic works via "System Preferences". Anyone have any ideas on what the problem(s) could be and suggestions on how to resolve this issue? Thanks.

ffmpeg -f alsa -ac 2 -i hw:0,0 -f x11grab -r 30 -s $(xwininfo -root |  grep 'geometry' | awk '{print $2;}') -i :0.0 -acodec pcm_s16le -vcodec  libx264 -vpre lossless_ultrafast -threads 0 -y screen-capture.mkv