Audio goes out of synch

[Semaphoric]

I have a Flash video I downloaded, and want to include it in a DVD project. Unfortunately, the audio is out of synch. I was going to convert it to an MPG with Tmpgenc XPress 4.0, but found that when I offset the audio to be in synch near the beginning, it was way out of synch near the end (about 20 minutes). So, it seems I need to make the audio about two seconds shorter.

I just got the upgrade of Sound Forge 9 (haven't used Sound Forge in ages, though), and as I said, I have Tmpgenc Xpress 4.0. What would be the best way to proceed? De-mux the resulting MPG and work from that, load the whole thing into Sound Forge, or what?. Can I possibly just do this inside Tmpgenc?

[guns1inger]

Audio going gradually out of sync usually means that you have altered the framerate of the video when you encoded.

You have two choices.

1. Re-encode the video correctly, preserving the original framerate. The problem here is that flash can have any framerate, so you may not get DVD compliant files.

2. Use Sound Forge to alter the audio length to meet the new video running time.

Confirm the framerate of the original flash source. If it is DVD compliant, then use the original framerate. If it is not compliant, but less than 29.970 fps, you may still be able to make it work. Encode it at the source framerate, then use DGPulldown to add a custom pulldown from the framerate to 29.970. This will avoid the need to alter the audio length.

[Semaphoric]

I didn't encode the FLV file, I just downloaded it. The site I got it from did warn that it was out of synch, but I need it to complete my project. So, it looks like the tool of choice is Sound Forge.

The question is:

Do I (can I) load th FLV into Sound Forge, and do it there, then re-encode to MPG.

Encode to MPG, and load that into Sound Forge. Or,

Encode to MPG, De-mux, work in Sound Forge, then re-mux.

?

[guns1inger]

Encode, demux, repair, remux.