Hey all. I've been toying around with encoding HDTV, complete with AC3 streams. I grabbed a large chunk (about 3.5 GB), and encoded it to xvid using the following command: mencoder stream.ts -vf scale=1280:720,dsize=16/9,pp=h1/v1/dr/al/lb -sws 10 -oac copy -ovc xvid -xvidencopts pass=2:bitrate=4000:me_quality=6:vhq=4:chroma_me:qpel -o stream.avi The "-oac copy" works, and I get an xvid file with ac3 audio. However, if I just want to make another mpeg file like so : mencoder stream.ts -oac copy -ovc copy -of mpeg -o stream_1.mpg there is no audio. Any idea why "-oac copy" works for xvid, but not standard mpeg ? I've used "oac copy" for streams with mp2 audio with no problems ... I'll appreciate any help.