Change in converted video length

[DLister]

Hi all! I've noticed that when I convert a video from .avi to mpeg-2 with TMPGEnc the new video loses roughly 1 second for each 10 minutes. It's probably not important, but is there anything I can to to make certain the converted video is the same length as the original? It is safe to assume that the mpeg is running slightly faster, or is something else going on?

Also, I'm using another program to encode the audio to AC3. The AC3 files are the same length as the original video, and thus slightly longer than the converted video. I've been using TMPEGnc's tools to multiplex them, and I was wondering if the program adjusts the audio file so that is still in synch with the video. If so, does it do this by running the audio track slighly faster, or what?

Thanks guys!

[cooljoe666]

First of all.........

The resulting video file could lose time if it was encoded w/ errors present, which is common. You have to remove errors or fix a file before coverting.

As for the audio, if you are changing video framerate seperate from the audio then obviously you will have to re-encode the audio to compensate. There are other issues depending on what programs you are doing and what processes you are using to do your project. In other words, more info needed to be exact.

Muxing doesn't sync audio and video. It just starts at point 0 of both files and zips them together, that's why you have to carefully make sure both the audio and video are given proper attention.

[DLister]

For the sake of simplicity, let's say that I just use a Canopus ADVC-100 to capture analog video, then save the file using Windows Movie Maker. All I do then is run it through TMPGEnc and end up with mpegs slightly shorter than the original avis. VDubMod is not detecting any errors in any of the original files, and the number of frames in the two files is identical...

Any idea what else might be causing it?

Thanks for the reply!