Audio goes out of sync on certain xvids

[Lelon]

Occasionly I'll try to watch an xvid that is synced correctly at the beggining, but looses sync throughout the movie. After 15 minutes its several seconds out of sync.

In comparing this movie to the xvids I have that work, I notice it has FPS 29.97 in gspot, whereas all my others are 23.97. It also has VBR mp3 (but I have others that use VBR mp3 with 23.96 fps that work fine).

These is what gspot gives when I render:

(S) --> AVI Splitter --> XviD MPEG-4 Video Decoder --> (R)
(S) --> AVI Splitter --> MPEG Layer-3 Decoder --> MatrixMixer --> (R)

I would like to either 1.) figure out how to watch these in sync, because everyone else seems to view it fine or 2.) find a simple way to fix the file (even if it takes forever)

[bUR]

No idea why this happens. Anyway, you can try to fix it. When the audio in in snyc at the beginning and looses track at the end, it probably is shorter than the video for unknown reasons.

So save the audio as a seperate wav, then with some audio editing tool adjust the length of the audio to that of the video. Cooledit for example can do this without changing pitch.

Now re-encode the audio (use CBR as maybe that caused the trouble) and mux it with the video.


Is th audio late or plays too early? If it's late, maybe the video was meant to play at 23.97 fps, so with 29.97 it plays too fast, leaving the audio behind. In that case, adjust the framerate to 23.97