vlc has a recording function (you may need to tick a box to get it to show up on the interface) so try this first, otherwise you can try calamari's x264 recording script on the google group pages or something like this with ffmpeg/mplayer:
somagic-capture --ntsc-4.43-50 --sync=1 --iso-transfers 20 -B 149 -C 72 --luminance 2 --lum-aperture 3 | ffmpeg -f rawvideo -pix_fmt uyvy422 -vtag 2vuy -s 720x480 -y -an -r ntsc -i - -f alsa -i hw:0,0 -aspect 1.77 -b:v 2200k output.avi
(You may need to change some settings, especially the ntsc-4.43-50)