audio out of sync

[ShortTiger]

I try to convert + add permanent sub from avi file to mpg file
but when it is complete, the audio is faster than the video
Anyway, when I play it from originally avi file, everything is fine

I use gspot to see the detail, it show like this
video : div3 , DivX 3 Low-Motion
Bitrate 647 kb/s

Audio : 0x0055(MP3) ID'd as MPEG-1 Layer 3
Bitrate : 128 kb/s (64/ch, stereo) CBR

I use virtualdub to start frameserver and then TMPGEnc to convert

What should I do to fix this problem ???
Thank in advance

[guns1inger]

Is the audio constantly fast (i.e. the same amount throughout ?) or does it get faster over time ?

[ShortTiger]

The audio is faster throughout the file ..

[qda]

i am having a similar problem

my avi plays fine, but when i use Nero Vision to make a dvd out of it, the audio starts OK but it goes more and more out of sync as more of the movie plays..

how can i fix this?

edit: little more info..

its an xvid avi with VBR ac3 audio inside it
CORRECTION: its not ac3, its mp3.. i dunno why i thought it was ac3.. see below

[redwudz]

qda, extract the audio as a WAV with VDMod and use that instead to encode with. If you want AC3, ffmpeggui can convert it back. VBR audio is likely the problem.

https://forum.videohelp.com/viewtopic.php?t=280779

[NormaJ]

VBR AC3 audio
Does that exist?

[qda]

redwudz, i extracted the WAV with VirtualDubMod as you said, and then used VirtualDub to 'save Avi' using direct stream video from the original avi, and the WAV that i extracted, and Nero Vision burned the dvd exactly the same, with the sound starting fine, but lagging by about 1 second by the end of the movie...

NormaJ: i dont know much about AC3.. when i open the movie in virtualdub or virtualdubmod, i get the warning message: "...detected an improper VBR audio encoding in the source avi... etc" what does that mean if the audio is AC3? CORRECTION: its not AC3, its mp3 vbr! oops..

still though, i dont know what to do..
here is a Gspot screenshot of the file:



ANOTHER UPDATE

the extracted WAV (of another avi that i am having the same problem with) has the length of 50:56.64
gspot says the video runtime is 50:57.something (dont if it's rounding up)
going by that that's a second off, which is how much the sound goes out of sync by the end of the movie..

any ideas?

[redwudz]

I'm kind of like NormalJ, I haven't heard of AC3 VBR. But, either way, if VD will extract it, it should be OK. ( I see your edit, MP3 VBR ) OK.

You may have a different problem. Check the length of the video VS the length of the audio WAV and the original MP3 audio. VD will tell you that, or Gspot. If the audio length is different than the video length you would have to adjust one or the other to match.

Too much to cover at the moment, but you could put the WAV into Audacity and pad or trim it, if you knew the exact difference in the two lengths. VirtualDub can also add or subtract an offset in the audio if the sync has the same amount of error the whole length of the video.

This type of problem can also be related to bad edits or missing frames or missing audio, causing the lengths to differ. This can cause the sync to be fine for, say, half the movie, then go bad. Harder to fix, requires editing, splicing, etc.

ShortTiger, hopefully some of this may apply to your problem, also.

EDIT: qda, can't tell the lengths from the screenshot. You might want to use the newest version of Gspot, 2.52. It sometimes gives better info.

[qda]

OK so i installed SyncView:

the video source, i used the AVI
the audio source, i used the extracted WAV

says length of video is 50:56.765
says length of audio is 50:56.640

when i burn to dvd in NeroVision, the sync is off by about a FULL second, its much more noticeable than 0.1 of a second..

so theoretically the lengths are fine, there is another problem here? any ideas?

(does anyone know what 'smart encode' does in NeroVision?)

[qda]

also, I used NeroVision to 'export' the avi to a mpg, and the delay is there as well...

this is driving me nuts, i have a lot of avi's that were encoded this way, and i gotta get them all on dvd

[Jim44]

redwudz, i extracted the WAV with VirtualDubMod as you said, and then used VirtualDub to 'save Avi' using direct stream video from the original avi,

Is that last step, saving the AVI video stream, necessary? The few times I've had to deal with VBR MP3 audio (8-10 times so far), I've only extracted the audio to WAV, then input the original AVI and extracted WAV into TMPGEnc and created the MPG2. Worked fine so far. (Authored with DVDAuthorGUI and burned with either DVD Decrypter or ImgBurn, FYI.)

Jim

[qda]

Jim44, I'll try that..

However, if anyone still has a solution that does not involve converting to mpg before making the dvd, it would be great....

[Jim44]

Jim44, I'll try that..

However, if anyone still has a solution that does not involve converting to mpg before making the dvd, it would be great....

Umm, you're aware that you DO have to convert to mpg (specifically MPEG-2) format before authoring a DVD, right?

My method uses individual programs for each step - if you're using some type of "all-in-one" tool, some of the details or intermediate steps may be hidden from you, but they perform the same process. The advantage to using individual tools is that you have more control over the process and are better able to deal with anomalies like, oh, VBR audio

Good luck,
Jim

[qda]

oh, so once i make a mpg, there needs to be no further conversion? the only problem is i do use an all in one because i leave this encoding to happen while i sleep, so i cant go back to the computer to do the individual steps really...

but thank you

[Jim44]

You can do the same wth a stand alone encoder. That's usually the longest part. Authoring seems to be the second longest.

I too let the encoding go overnight at times. Authoring for an hour or less of content with no menus takes 15 minutes or less, in my case, including making the ISO for burning.

Jim