If some of you are just adding the LPCM wav file to the original DVD video that you've ripped from the retail DVDs, you may be running into a problem of having a bitrate that is bigger than the DVD spec allows. If I'm not mistaken, the DVD specification says that the maximum bitrate of a video/audio stream must not be bigger than 10.08 Mbps (10080 kbps). So, if you just add the LPCM wav file to the high bitrate video, your DVD player (on the computer or attached to your TV) may stutter and skip around when the bitrate gets too high. I'm not sure, but this might also cause problems when checking how well the audio synchs up with the video.