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Old 28th August 2008, 20:34   #1  |  Link
chefelf
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How Do I Fix Gradual AVI Sync Problem With VirtualDub?

I have an AVI that gradually loses sync over time. I've tried following the instructions here ( http://forum.doom9.org/showthread.php?t=111451 ) using VirtualDub but the problem is that the file size is HUGE when I save it (from 850mb to over 8gb).

I've tried searching everywhere for a solution to this but I can't seem to find anything.

I'm sorry for my ignorance on this matter. Any help/guidance would be greatly appreciated. (I'm not married to VirtualDub, any fix will do).

Thanks!
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Old 28th August 2008, 21:26   #2  |  Link
setarip_old
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Hi!
Quote:
the problem is that the file size is HUGE when I save it
Make certain that BOTH "Video" and "Audio" are set to "Direct Stream Copy"...
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Old 28th August 2008, 21:38   #3  |  Link
chefelf
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Thanks a lot for the reply. That solved the video size problem.

However, the video still appears to gradually lose sync over time. Any ideas on how I could get it to match up?
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Old 28th August 2008, 22:03   #4  |  Link
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Re-read Section B of my post in the thread you earlier referred to at:

http://forum.doom9.org/showpost.php?...95&postcount=3
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Old 28th August 2008, 22:20   #5  |  Link
chefelf
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Thanks for the reply.

That was the method I'd been trying (before when I had the large file size issue) but the audio is still out of sync when I use the method in part B.
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Old 28th August 2008, 22:39   #6  |  Link
setarip_old
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When you originally created the .AVI, did you make it in two parts or only one?

Please load the original .AVI into GSpot and post a screen capture back here...
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Old 28th August 2008, 23:00   #7  |  Link
chefelf
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Thanks again for all the help. Here's what I got in GSpot:

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Old 28th August 2008, 23:18   #8  |  Link
poisondeathray
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What was the original source? (The reason I ask is: If it was a VFR video - variable frame rate - like a VFR .mkv or VC1 stream, you have to redo your process converting to .avi properly, this one would be unsalvagable)

If the duration of the audio & video don't match, and this is the usual case for progressively worsening sync problems; this can be fixed by either shinking/expanding either the video or audio to match. The video is usually easier to change. There is more than 1 way to do this, but here is a guide http://www.gromkov.com/faq/faq2004-0064.html
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Old 28th August 2008, 23:42   #9  |  Link
chefelf
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Thank you so much for the link. I'd stumbled upon that before but I was confused. I used the method described in "Situation 2" and it took a little trial and error but I got the audio/video synced very closely.

Thanks again for all of your help!
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Old 29th August 2008, 01:59   #10  |  Link
setarip_old
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@chefelf

Please be courteous enough to answer the questions of those who are trying to assist you:

1) I ask you again, when you originally created the .AVI, did you make it in two parts or only one?

2) Why the odd combination of DivX-style packed bitstream .AVI and AVI v.1.0?

And asked by "poisondeathray", what was the original source?
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