I downloaded a movie with two audios, so I opened the movie in VirtualDub and did "direct stream copy" of the video and "full Processing Mode" (PCM) of both audio, so I converted the video for "mpeg-2" using the QuEnc, so I converted the files. wav files of audio for "ac3", then I used DVDLab Pro to finish, but one of the audio is out of sync, but the file "avi dual layer" it is running perfectly with both audio, could someone tell me why?

thanks.