How to Adjust Audio/Video Sync In An AVI File Using VirtualDub

Thanks for the info! Very helpful!

cant get that info to work my audio is still miles ahead of video

What is the differenct between doing this and re-encoding? Would re-encoding be a more proper way of doing it? If so how would I go about re-encoding? Thanks jd

Re-encoding means less quality and more time. Here you don't need re-encoding because you do not need to write either the audio nor the video stream, it's more like re-aligning the two streams.

thanks for the quick reply and excellent tutorial.

This has been extremely helpful, I've got a couple though that are out of sync but they get progressively worse. Any pointers on how to straighten that out?

Trial and error, sometimes it's not very easy to adjust the sync in one shot.

You have missed out the step before this where you find out what the delay is. http://polybore.blogspot.com/2008/05/avi-file-sound-out-of-sync-with-video.html Includes video tutorial.

Thanks for the help. I also used the link Polybore gave, but had a more complicated audio drift (worse as time goes on). Solution: 1. use virtualdub to save the audio and video separately. 2. use 'super' to convert the audio from mp3 to wav. 3. use "Wavefile Length Adjust" to stretch the audio to the same length as the video (virtualdub tells you both durations and you give them as a ratio to WLA.) 4. use 'super' to convert the wav back to mp3. 5. use "AVI-Mux" to put the video back together!

Thanks for this and especially for Polybore's tutorial for determining the exact value for the delay. Saved me tons of grief!

Thanks, worked perfectly first time. I found out the video delay (1sec 109ms) with the free "MediaInfo" program, then used your tutorial. Perfect sync first time! Thanks again.

hello, Im trying to sync audio to a video, but the audio i am using is about 5 minutes longer than the video, so what do i do?

Hey mine was of by (15100 MS) hope that helps it was an error with my spliting program though and i lost the first bit of sound vertual dub has all the glory

Thanks for the great tutorial. Very useful. I followed the steps and it worked perfectly.

Very good tutorial! I am digitising a batch of Hi8 Camcorder tapes and have bad out of synch A/V. I like the power of VirtuaDub but I don't understand why I never get out of synch A/V using Ulead VideoStudio but invariably get it with VirtualDub. Can someone please help with a question? The tutorial suggests that both Video and Audio must be set to Direct stream mode. But that disables processing, and with these videos I definitely need to use the de-interlace filter, which of course needs processing mode. Do I run one pass using Direct stream to re-synch the audio, and then another pass in Proessing mode to use the de-interlace filter? Or is there a better way to do it? Many thanks.

really helpful.........

ohh my gosh, thank you soo much for posting this i have tried this and it works.I had a video that i had to put off because the audio and the video were out of sync. Now i have learned something new.

OK, I have a video capture where the audio goes out of sync in the middle after an encoding error. Can this be fixed? I don't want to save it until I am sure that the A/V is in sync after that point. again, can that be done?