But I can play the file through WMP and there is audio all the way though.

I'm using PCM audio codec at 44khz at highest setting 172kbps and huffyuv for video codec.

I don't get this problem if I use Mpeg Layer-3 audio codec at the highest setting.

Could it be that my hdd is not fast enough. It's an empty 7200rpm 2meg buffer 80gig drive on its own ATA line.

Thanks if anyone can help.