> mencoder -ovc copy -oac copy -lavcopts vcodec=msmpeg4v2 -of lavf > -o?<output file path>? <list of files to merge> Err... You say -ovc, that is, don't change the video codec, and specify -lavcopts vcodec=msmpeg4v2, that is change video codec to msmpeg. Hard job to do, ins't it, changing the codec without changing it. > 1.??It does not have any audio even though the individual files have > sound Have you tried two files that use the same audio codec? I could imagine that sound might be hard to play when it starts as stereo mp3 and changes to ac3-surround midway in the file. > For the first problem, I previously tested it with .wmv files that I > encoded in our encoding workstation and the merged file had no problem > with the audio. Presumably they all had the same audio codec. when using -ovc copy -oac copy to concatenate files, make sure they have identical codecs in the first place. Or re-encode them. Greets, Kiste