Virtualdub error after loading a divx

[Hyde]

hello,
i get this error after loading a divx in virtualDub version 1.5.10:

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VirtualDub 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 compatibility. This may introduce up to 5984 ms of skew from the video stream. If this is unacceptable, decompress the *entire* audio stream to an uncompressed WAV file and recompress with a constant bitrate encoder. (bitrate 111.3 +/- 7.0 kbps)
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Can someone please tell me what to do? i tried to separate the audio stream from the video and then recompressed it in ac3, but when i make the final DVD, i found that at the end of the movie, the audio isn't syncronized with video.

Thanks

[Laddydaddy]

Hello Hyde,
Rather than separate the audio and video, you need to convert the audio into a wav file. Click audio>full process mode. Then file>save wav. Use your newly created wav file for the audio.

[Abond]

Option 1 - use Virtualdubmod to save the audio as wav (Full Processing!)
Option 2 - use Nandub to demux the audio (or to save it as wav)

[Hyde]

ok... thanks but this is what i did!!

i saved the audio stream as a wav file. Then a passed it to besweet to to make a 224 bitrate ac3 file.
the problem is that when i author the dvd and so join the audio stream (ac3) with the encoded video stream (mpv), at the end of the movie i get the audio unsynced with the video.
if i watch the movie in its source format (avi xvid), i dont get the gap.

[Laddydaddy]

Are the frame rates for the original avi and the encoded video the same, or are they different?

[Hyde]

don't remeber now..... i deleted the encoded file
I'll reencode it right now.
if at the end they're not the same, what should i do?

[erratic]

Try this: use VirtualDubMod instead of VDub. VDMod will complain about VBR audio and ask you if it should rewrite the header. Click No. Then convert to WAV with VirtualDubMod -> Streams -> Stream list -> Save WAV.

EDIT: By the way, instead of Save WAV you can also try Demux. That will save your audio without decompressing it.

[Hyde]

ok, i'll try that.

i also have another problem on this divx.... the first pictures have the text:

WARNING: NOTHING TO OUPUT
BFRAME DECODER LAG

How can i get rid of that?

[erratic]

I found this regarding that particular error.
https://www.videohelp.com/forum/viewtopic.php?t=212108&highlight=bframe+decoder+lag

[SaSi]

I've been given some AVI files with VBR audio encoding and had similar problems.

The VirtualDUB solution that seems to work best is the following:

As soon as opening the file, and without playing any of it!

Select Audio-->Full Processing mode
In Audio Compression, select No Compression

In Video, select Direct Stream Copy (no need to waste time to decode and re-encode)

Save the AVI file under a new name

The resulting file will be slightly bigger (as audio is uncompressed) but audio and video will be in sync.

If you need to encode the new AVI into MPEG2 you can directly feed it to an MPEG-2 encoder.

If you need to trim it, resize it, or whatever, you can open it with VirtualDUB as usual.

[Suntan]

The Bframe Decoder Lag is simply a warning that the MPEG4 video stream was processed with Bframes and they did not use packed bitstream. All it really means is that when you advance through frame by frame or jump to a part (by using the sliderbar in Vdub) you may get frame lag as it needs to process a few frames before it can get them in the right order. If all you are doing is opening a film then encoding/converting then don't worry about it. If you want to read more about it look in the Xvid forum at Doom9.org for threads pertaining to "packed bitstream".

-Suntan

[johns0]

If the avi has any bad frames(garbled looking)then the audio will go out of sync at that point,just look for the bad frames at the point the audio goes out of sync and add a few seconds of audio to resync.