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Unofficial VirtualDub Support Forums > Newbie Questions > How To Correct Improper Vbr Audio In Virtualdubmod


Posted by: leopard392 Dec 3 2013, 10:26 AM
Dear all,
I try to open an AVI file with audio mp3 using VDM 1.5.10.3, but it says VBR audio stream detected Error blah blah... which asked: Do you still want to rewrite the header? Despite have disabled in the Preferences (Do not correct MPEG Layer III audio streams checked), but it was still considered errors..!

It's so funny when opened by VD (VirtualDub 1.10.4) is no problem, there is also a correct mp3 streaming with the constant bit rate.
Could anyone help with this? Any help or ideas will be greatly appreciated, thank you.

Posted by: leopard392 Jan 13 2014, 10:23 AM
no one to response..??

Posted by: dloneranger Jan 13 2014, 12:19 PM
There's no solution to problems with virtualdubmod
It's not even from this site, it's a very old modified version of virtualdub that's abandoned

You could try exporting the audio stream and reimporting it, that's the only thing I can suggest

Posted by: leopard392 Jan 13 2014, 12:48 PM
Okay, but the question about Do you still want to rewrite the header, what should I have to do, Yes or No? I guess No.. am I wrong?

Posted by: raffriff42 Jan 13 2014, 01:21 PM
Yes seems to be recommended: "the current preference is to rewrite the audio header"
user posted image
...but you have to try it. And try not to use variable bitrate MP3 in the future.

Here's what the latest VirtualDub says about variable bitrate MP3:
user posted image

rewrite header = possible sync drift
don't rewrite header = some players might not accept it.


.

Posted by: dloneranger Jan 13 2014, 01:21 PM
Try it both ways and see what works best?

Yes means it should change the header to a cbr one
No means it should leave it alone
Both could cause problems or be fine (when seeking or with sync offset etc)

Posted by: Altaf Jan 13 2014, 01:51 PM
1) It is necessary to close this window simply. Not in which case to disagree!
2) After recode in CBR.

Posted by: leopard392 Jan 13 2014, 05:55 PM
QUOTE (raffriff42 @ Jan 13 2014, 01:21 PM)
Yes seems to be recommended: "the current preference is to rewrite the audio header"
user posted image
...but you have to try it. And try not to use variable bitrate MP3 in the future.

Thanks for quick reply, I always use CBR in MP3/AC3 streaming. Here's my experiments:
1. If I choose Yes to MP3 audio (thereafter export to wav to reconvert MP3+CBR), and after importing there will be a delay between video and audio where the singer's lip movements are not synchronized to the song (fractions of a second). If I choose No, there will be good without any delays.
2. But if I use AC3 audio, choosing Yes or No remains the same worst will always delay, but this will be resolved when I use AC3 delaycut 1.4 to fix it.

QUOTE (raffriff42 @ Jan 13 2014, 01:21 PM)
Here's what the latest VirtualDub says about variable bitrate MP3:
user posted image

rewrite header = possible sync drift
don't rewrite header = some players might not accept it.

Selecting both Autodetect or Constant bit rate (CBR) are equally fine - no difference at all, because before converting, the video contained CBR already.
Well, that's my experience after trying repeatedly, any ideas?

Posted by: leopard392 Jan 13 2014, 06:02 PM
QUOTE (dloneranger @ Jan 13 2014, 01:21 PM)
Try it both ways and see what works best?

Yes means it should change the header to a cbr one
No means it should leave it alone
Both could cause problems or be fine (when seeking or with sync offset etc)

Yeah.. just try it both already, thank you (see answer above).
Any some advices?

Posted by: leopard392 Jan 13 2014, 06:04 PM
@Altaf: Haven't try yet, thanks.

Posted by: meowmeow Jan 15 2014, 05:15 PM
Is it just vbr mp3 that some stupid third-party VD old clone can't open?

MeGui can "multiplex" in/out multiple A/V tracks in various formats/containers.

AVI - don't use multi-audio tracks in AVI - HW players can't read them anyway. And VBR too.
Delete the Mod clone from HDD and everything's finely fine.

for vbr audio best use mp4. mkv format is somewhat incorrect seems to me.

Posted by: raffriff42 Jan 15 2014, 07:15 PM
@meowmeow,
>Is it just vbr mp3 that some stupid third-party VD old clone can't open?
See my second screenshot - that's Vdub 1.10.4. VBR MP3 is opened, but you still get a messagebox.

@leopard392,
Just recode at CBR and get it over with! wink.gif

Posted by: leopard392 Jan 16 2014, 06:37 PM
QUOTE (meowmeow @ Jan 15 2014, 05:15 PM)
MeGui can "multiplex" in/out multiple A/V tracks in various formats/containers.

Yes, the same too with SUPER © and Hybrid.
For me MKV is good without any problem, it's more modern than AVI.

Posted by: leopard392 Jan 16 2014, 06:41 PM
@raffriff42, Ya well.. that's what I did, thanks.

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