virtual dub audio problem

[Reggiee]

am trying to create a wav file from a high quality avi file. However when i open the avi file in virtualdub I get the following error message
Virtual Dub has detected an improper VBR audio encoding in the source file and will rewrite the header with standard CBR values. This may introduce up to 11350 ms of skew from the video stream. If this is unacceptable (which it is) decompress the entire audio stream to an uncompressed WAV file and recompress with a constant bit rate encoder. Bitrate : 190.4 =/- 22.3kbps.

erm ... what does this mean and what do I do now ??

Thanks

[DJRumpy]

To see what kind audio your AVI has, select FILE | PROPERTIES. This should tell you if it's AC3, MP3, etc.

Select FILE | SAVE AS WAV from the menus.

Rename your saved WAV back to the correct extension.

Once you do this, you may need to convert the format of your file, depending on what your going to do with it (i.e. Convert to MP2 for SVCD/VCD/DVD ).

Encode your AVI as usual, and then multiplex your audio back in with TMPGenc (FILE | MPEG TOOLS)

[Reggiee]

thanks but this didnt work - says cannot create mpg file - sorry but Im totally lost - help !!!!!

[wee haggis]

File > Open > movie.avi > Audio > Full Processing Mode > Compression > No Compression PCM > Audio > Conversion > No Change (if its already 44100 ) or change to 44100 (if VCD) .
Open TMPGE and use WAV you created as Audio Source.

[wee haggis]

Sorry...forgot last step....
File > Save As WAV.
this will probably be in the order of 1 gig or so (for a full length quality movie)

[DJRumpy]

Reggie, read the above instructions carefully. You've gone down the wrong path somewhere...

Both wee haggis and my instructions are in VirtualDub application. The options are all off of the menus. You should not be getting an 'MPEG' type error here, as VirtualDub cannot create an MPEG.

[Reggiee]

Guys thanks for the help but no luck. Whatever i try it seems to be out by about 3 secs mid movie. Tried saving the wav file at 48000 rather then 44100 and then downsizing to 44100 but no luck. I despair as the avi file is so good - b*****s !! (-:

[0 kewl]

Reggie,

I'll just repeat what DJRumpy and Wee Haggis just said but maybe it will make it all clear to you.

If your audio is MP3:

1) Open AVI in Virtual Dub
2) go to Audio->Full processing mode
3) then Audio->Compression->no compression(PCM)
4) then Audio->Conversion->tick 44100Hz (for VCD)->press OK
5) go File->save WAV->choose new file name for your WAV and location for your output file->SAVE
6) load the resulting WAV file as Audio and original AVI as Video in your preferred encoder

If your audio is AC3:

1) use this guide

http://www.vcdhelp.com/forum/viewtopic.php?t=91588&highlight=ac3

2) load resulting WAV as Audio and original AVI as Video in your preferred encoder


If even then your sound is out of synch then check if your original AVI had the same problem (check the end of the movie to see if audio is in synch) - if out of synch, you might need to adjust the length of your Audio so that it matches the legth of your Video using CoolEdit, GoldWave or BeSweet.

Regards.

[banjazzer]

Guys thanks for the help but no luck. Whatever i try it seems to be out by about 3 secs mid movie.

You also need to scan the video stream for errors. Look under the Video menu.