I'm working with a video file (lizard.avi) from an older digital camera. It has uncompressed PCM audio and motion JPEG video. It plays fine with mplayer. I am trying to re-encode it with mencoder, thinking that better video encoding might reduce the file size. What I'd like to do is the following: mencoder lizard.avi -oac twolame \ -ovc lavc -lavcopts vcodec=mpeg1video:vbitrate=2000:mbd=2:trell \ -of rawvideo -o output.mpg I chose this encoding because it is one of the few that seems to play on most of the XP machines my relatives will be using. The encoding fails with: ae_twolame, 1 audio channel, forcing mono mode twolame_get_samplerate_index: 11024 is not a legal sample rate Not a valid samplerate: 11024 Any ideas on how to make this work (or whether I can even expect to reduce the file size with better encoding)? Thanks.