Hello list! Try this: mplayer video.avi -audiofile audio.mp3 When you feel lucky hit the 'q'-key to quit mplayer and it will crash instantly. Another issue is muxing the two streams together: mencoder video.avi -audiofile audio.mp3 -ovc copy -oac copy -o new.avi It will skip lots of frames and the result will be out of sync badly. It seems to crash, too, but not hard as above. I could post a lot more info like the devs want on their website, but I guess it's happening to any x86 user anyway (I'm on a gentoo box and I also chattet to a Slackware user in #mplayer on freenode who suffered the same crash) so there's no point to tell you guys about the specifics of my system ;-) Sure thing it happens relatively seldom a user wants to use a seperate audiotrack with mplayer, but I think more people want to mux two streams, so it'll be great to have that fixed :=) Cheers Sebastian