audio sync in half of avi

[macyman]

I am trying to split an avi with Virtual Dub.
The first part is fine but the second half
has audio out of sync. There are no bad frames.
What else can I do?
By the way, I did get the usual VBR bitrate error
message for the audio.

[0 kewl]

If it isn't a gradual off-synch but starts at a specific point in the movie then you need to find that point, cut your AVI there in 2 parts with Virtual Dub, delay or preload audio for the required time in the 2nd part then resave it with synched audio and join the parts together.

[macyman]

the movie is fine before I split it.
So what you tell me doesn't really solve
my problem

[0 kewl]

the movie is fine before I split it.
So what you tell me doesn't really solve
my problem

Well, how can we help you if you don't give more details. You said you are TRYING to split AVI, which (to me and in general) usually means you haven't done it yet which, in turn, means that the AVI file had the problem BEFORE splitting. If you don't give us a detailed and clear description of your problem we will go around guessing. Why are you splitting AVI? To burn to 2 CDRs as AVI or to load into TMPGEnc separately for two Mpeg files? Each case has a different solution.

[macyman]

trying to split also means that it doesn't seem to work.
At any rate, I need to split to then encode and
fit on 2 cd's

[0 kewl]

Why not extract your audio as WAV in Virtual Dub, then load WAV as audio and AVI as video source into TMPGEnc and let TMPGEnc encode your whole AVI into 2 Mpeg files as ****CD1.mpeg and ****CD2.mpeg.

[macyman]

I tried that already.
Look I need to split the avi but the audio
goes of sync only in second half.
How can I fix this?

[bugster]

macyman said:

By the way, I did get the usual VBR bitrate error
message for the audio.

That is probably the root of your problem so try this.

OPen the avi file in goldwave. File->save as and save a new wav file, uncompressed PCM 16 bit stereo.
Close Goldwave.
Open virtualdub and open you avi file.
Video->direct stream copy.
Audio->wav audio (select your new wav file)
File->save avi and save a new copy of the avi.

Now open your new avi file in vdub and split it, see if that helps.

If your target is to keep it as avi and simply burn it to CD as data, this new avi is too large. In that case after re-eopening the new avi file in vdub do this:

Video->direct stream copy
Audio->full processing mode
Audio->compression (select your favorite codec)

You can split it at this point and when you save as avi it should also compress the audio.

Hope this helps.

[0 kewl]

macyman,

If you mean that after splitting your AVI in Virtual Dub your second half is out of synch then just load the 2nd half back into VD, go to Audio->Interleaving...and in the Audio Skew Correction box enter the required delay time and save AVI under new name (selecting Direct Stream Copy under both Video and Audio).

[macyman]

I'll try and let you know.
Thanks for your help.

[romu]

Better solution - load the 2nd part in Virtual Dub, and save a wav file.
Open the 2nd video part in media player and try to determine more or less by how much (in seconds) the audio is out of synch.
Then open the wav in Cool Edit, and adjust it accordingly. For example, if your audio is "late" by, say, 0.2 seconds, zoom in the very beginning of the wav in Cool Edit, and delete 0.2 seconds, then go to the end and generate 0.2 seconds of silence. Save the wav WITH A DIFFERENT FILE NAME (this is just in case you need to try again, you would still have the origoinal file). Open the avi and the new wav file in TMGENCGPG or whatever, and encode a few seconds. See if it's ok. If not, try to determine now by how much it's still out of synch, and open your original wav again, and adjust. It shoudn't take you more than 2 tries, I always get it right the 1st time.

Now encode your avi and wav in TENMPG, and it will be in synch.
This MAY take a little more time, but is much more accurate.

[DVD Dude]

a simple solution hopefully. use Avi Chop. The only problem is that you have to guess where to cut it. so you may have to cut it a few times. Hope this works.

[Rapplin]

As per what ROMU said above, i will do what he suggested, but how can input the edited wav into dvd2svcd for my conversion?
I have an avi i split also, and the second half is out of sych too. i have successfully used dvd2svcd w/ CCE for conversion from avi to mpeg for the first half (no synch issues.) and yes i did use guides here to extract the audio already, but still out of synch. I feel i will now need to edit the wav of the second file.
.....So after i do, does dvd2svcd give you the option of using the avi, and then selecting the specific wav file i edited?.......what will happen to the original wav that is already in the avi? hopefully it will be ignored