Virtual Dub Error Message

[budgirl357]

Vdub has detected an improper VBR audio encoding in the source AVI file and will rewrite the audio header with standard CBR values during processing for better compadibility. This may introduce up to 90 ms of skew from vidwo stream. If unnacceptable decompress the entire audio stream to uncompressed wav and recompress with constant bitrate encoder

.

I got the above message after opening a file in video dub. It will allow me to go ahead an extract the audio, but I just want to understand what this message means and what is the best thing for me to do in this case.
Thanks!

budgirl357

[KingJohn]

Its telling you who every made the audio use a Variable Bit rate, if you try to edit this file as it is, you will end up with lip sync problems. in this case 90Ms difference.

Now...

I do this;

Audio > Full processing mode
Audio > Conversion > 44.1Khz (No other change)
SAVE WAV

This will make a large WAV file, that can later be used with TMPGEnc along with your original AVI

However if the audio is AC3 you may have difficulty in that simple operation, you may need to save out the audio using streaming, and later a program to convert the audio to a WAV uncompressed at 44.1Khz

Audio > Direct stream copy
SAVE WAV

I should try the first item, this works most of the time