AVI to VCD Audio sync problem.

[JimGenius]

OK, I have got an AVI version of the film Kung Pow. When I read one of the guides, it said to seperate the audio from the file using virtual dub. However, when I loaded the file in virtual dub it said:

VBR Audio Stream Detected
VirtualDub has detected an improper VBR audio encoding in the source AVI file and will rewitre the audio header with standard CBR values during processing for better compatability. This may introduce up to 8184ms of skew from the video stream. If this is unacceptable, decompress the *entire* audio stream to an uncompressed WAV fileand recompress with a constant bitrate encoder. (bitrate: 195.5 plus/minus 16.1 kbps)

So the question is..how do I decompress then recompress so the sound is in sync?

[JimGenius]

Forgot to mention, it is NOT a constant sync problem.....

[jaimelynn]

I'm getting the same error message on a different DivX movie (dominion Chamber of Secrets CD1). When I run it through TMPGEnc I get a gradual audio sync shift -- the first 40 minutes or so are perfectly in sync, but eventually the audio becomes out of sync by about a minute. I have tried using the MP3 Freeze version of Vdub to see if any frames were bad, but none were found, so I'm back at square one. I have also tried decompressing the audio and recompressing it using a separate wav converter. This didn't work either. Anybody have any ideas?

Jaime

[KingJohn]

First... you don't always need to extract the audio, TMPGEnc will convert AVI's with VBR without problems. However if there is something wrong with the AVI (Junk frames) then you will need to fix it before you can convert.

The regular Vdub cannot be used to fix problems if the movie is using VBR audio, not without a hell of a lot of work anyway. instead use "Vdub MP3" you wont get a warning with that and can save out the audio "if you wish"

Something's that will help...

Bad frames, read section on VBR and Vdub MP3
http://www.vcdhelp.com/forum/userguides/135552.php


If you save out the audio in Vdub MP3, make sure you convert it at the same time.

Audio > full processing mode
Audio > conversion > 44.1Khz
SAVE WAV

You now have an uncompressed WAVE that is ready to be used with TMPGEnc

See also other guides