Audio out of sync - how solve?

[jansb000]

When I capture a video via my video-in, and connecting the audio cables to my soundcard the audio and video are out of sync.
The audio is several seconds late!!! The time-difference seems to be constant over the whole recording.

If I have a MPEG2 file (audio and video interlaced) produced by my capturing software, what would be the procedure to get the audio strip in sync with the video?

The only thing I can think of is this:
- demux the audio and video channel.
- cut some seconds from audio file.
- mux them together again.

Problem is that I can not measure the EXACT time that I must cut from the audio-file. How can I measure this accurately?

Any tips or alternatives?

[srsstvs]

Go buy a Canopus ADVC converter that will solve your problem. ADVC-50, ADVC-100 and ADVC1394 are basically the same, using the same codec thus having the same quality. The differences being 50 is internal, 100 is external, and 1394 comes with a firewire card.

If you are not familiar with Canopus products, they are the best because they come with audio locked function. The converter converts your analog to DV instantly as avi file (you'll need A LOT of hard drive space, about 25G for 2hr movie but digital quality), with the audio locked you will never experience a single frame drop and the AV will stay insync no matter how long the movie is.

How do I know? I have the ADVC-50, cheapest of all three (around $200) but does exactly the same thing!!!! Excellent convertor!!!

Oh, did I mention it does realtime and it will NOT tie down your machine, you can do other things while it's doing conversion and capturing through your firewire!!!:)

http://www.canopus.com/ go check up their forum!