Audio badly out of sync in second half of conversion

[jbutty]

I am a newbie so please bear with me!

My problem is that probably 75% of the films I convert have a bad audio sync error. The film starts off fine and then there appears to be a few seconds of either freezing or pixelation on the screen. This appears to always happen about halfway through the film and this puts the audio out for a few seconds for the rest of the film.

I have watched them on my PC before conversion and they are fine, the problem seems to be in converting the AVI's to vcd format.

I have been using TMPGEnc to convert after first getting a WAV file using Virtualdub.

I have tried using Goldwave to get the WAV file, but the same happens. I have also tried running through Virtualdub MP3 looking for bad frames but none were found.

I also tried decompressing the whole movie using the decompressor that came with AVI2VCD, but all that did was give me a 1.7gb file and the same problem!!

I have searched this forum for help and I notice that I am not the only one with this problem. I have tried everything I have seen suggested, as above, but I am getting cheesed off with spending 2 hours converting and then getting an unwatchable vcd!

Surely all the films are not corrupt that I download, or is it a problem in the conversion?


Please please help..........Jason

PS My apologies if I have missed out something important, us newbies try our best!!

[wee haggis]

Is the source video XVID or DIVX ?
If its XVID, its normally better to feed it directly into TMPGEnc without extracting the audio.
DIVX ,extract the WAV first.

[DJRumpy]

The codec used is irrelevant if it's encoded correctly. The problem of gradual sync loss is probably more likely to be corruption in the source file. Since the problem is encountered right around halfway through, then it's probably where these files have been joined back together. If the problem is due to a corrupted source, then extracting the audio, before or after, is not likely to fix the problem.

[Laddydaddy]

jbutty;
Did you watch the entire film on your pc before converting? I had the same problem. Virtual Dub mp3 freeze scanned my film and said there were no bad frames. When I converted in TMPG I had a/v sync problems. I watched the original avi file all the way through and found frames so bad they stuck out like sore pimples. Once I deleted them I was fine. Try watching the entire film in Vdub and see if you have any bad frames. If you do, delete them and try re-encoding again.

[jbutty]

Thanks a lot for your help everyone.

The suggestion by Wee Haggis worked! The first film I decoded I ended up with no sound so I ripped the wav and tried again and it worked. I therefore assumed I had to do this with all my conversions.

I put the films straight through TMPGenc without touching the audio and they are fine.

After wasting weeks trying to find an answer it was that simple!

Doh!

Wonder how long it will be to my next post as I am getting addicted to this site!

Cheers!