joining avi in virtualdub

[pettinej]

I am trying to join 5 avi's in virtualdub.

I open the first avi then use append video avi segment to pull in the other files. I select direct stream copy and then save avi. When I am done I have a avi that has the video out of sync with the audio. All of the avi are from the same source and have the same sample rate. I am not sure what I am doing wrong.

Please help.
John

[Scorpion King]

My experience tells me that if my files play in sync in VD then they are in sync. By your appending operation being out of sync then I would bet it also played out of sync when you were creating it in VD.

VBR audio?

Good luck.

[redwudz]

I would check the lengths of the audio and video in each file. My suspicion is that you have some files that do have a sync problem, such as audio ending early or late and when joining, this is showing up as a problem. This can also be caused by missing frames within one of the videos. When playing the individual files, you may not notice the slight differences.

I have seen this most commonly with videos that have been improperly split into separate files, then have sync problems when joined.

What type of sync loss? Gradual loss or the same amount of error throughout the joined file? Gradual sync loss can be caused by missing frames or the audio and video being different lengths. Usually fixed by repairing the individual files. The second type of error can be fixed by applying a audio offset to bring it back in sync. VD can do that in 'Audio>Interleaving. Determining the right offset is the hard part.