> As well as cat *... , '-nosound' is also sure to produce desync. Use > '-oac copy' so mencoder has something to sync to. Okay. > For the merge part, > you can use '-A' to copy only video. So you use: ogmmerge -o final.ogm -A movie.avi audio.ogg If the output is out of sync. How to you calculate the delay? Amadeus