mplayer dump

tried to record a lecture in realmedia format with mplayer, but it keeps dying in the middle. cache seems to help it get farther, but it still chokes. maybe i just need to give it a _big_ cache, or use the -cache-min option:

mplayer -audiofile-cache 8192 -cache 8192 -dumpstream -dumpfile out.rm rtsp://etc