I've been encoding the simpsons season 6 DVDs. I'm using Xvid H.263 @ 700kbps. OGM file container. 2 Ogg audio tracks, both at 44.1khz. One at 80kbps, the other at 45 kbps. Anyways, here's a clip of the problem area: The video appears to be fine, but during playback, I get an error and the player has to be closed. WMP 6.4, WMP 10 and MPC all get the same error. I've traced the error to the first audio track (the 80 kbps one) and libavcodec for Ogg decoding. The tremor codec in FFDshow does not, however. I've re-encoded the video already, so that's not the problem. I've re-encoded the audio a few times using OggdropXPd. Q = 1, 1.01 and 1.5 all produce errors in that clip. Q = 2 does not, however. Neither does wav or mp3. switching the audio to the second track for the duration produces no error. So, I'm confused WHAT is going on that libavcodec will freeze at an exact point consistently with ogg audio encoded at q=1-1.5?