Audio Sync Problems when using VirtualDub

[awalton]

Help,

Maybe I am trying to do something that can't be done, but in the process I have burned many hours.

I'm trying to get DivX movies onto DVD+RW.

I am using VirtualDub to resize a DivX video from a non-standard aspect to PAL, i.e. 720x576 and frameserve this into CCE to convert to MPEG2. VirtualDubs bicubic function for doing this is fantastic. Also the DivX runs at 23.98 fps, DVDit will not accept a MPEG2 file unless the frame rate is 25 fps or 29.97 fps. Therefore I am also using VirtualDub to change the frame rate to 25fps.

So I have a great looking MPEG2 file at 720x576 25fps. Now all I need is the audio. I use VirtualDub to strip the audio from the DivX and then import the audio file into Premiere along with the MPEG2 file and use Premiere's stretch tool, to match the length of the audio file to the slightly shorter video file. I then export the audio file out of Premiere and I think great it's all done.

I import the MPEG2 and the audio file into DVDit, but they are out of sync? The files last exactly the same length of time, they start in sync and end in sync but get many seconds out of sync throughout the movie.

What am I doing wrong? It this something to do with VBR audio?

Any help, insight or a better approach would be very much appreciated.


Aidan

[RoopeT]

If the original DivX is 23.97 fps, you should resize to NTSC DVD resolution (720x480?) and encode with the original fps, and the run pulldown to change the framerate to 29.97.

Advantages:

720x480 compresses better than 720x576. You'll still have the same resolution, as resizing to a bigger frame size doesn't give you any REAL resolution increase. This way you shouldn't have any synch issues (no audio stretchin needed) and your DVD player can probably play NTSC as well as PAL. If your audio is VBR MP3 Nandub or some other tool might handle it better than VirtualDub. Also, frameserving with avisynth is a lot faster than with VirtualDub.