Video sync error

[Cuchulainn]

I've been having trying to convert AVI to DVD on and off for quite a while now and always run into the same problem. I use CCE 2.67SP and it always abreviates the video stream causing a sync issue with the audio. The amout it's out seems to be proportional to the file length.

The current example I'm converting an episode that's 43:08 as an avi and perfectly in sync but the m2v file comes out 43:05. It's not much of a difference but it's enough to be very irritationg. I've tried encoding directly from the avi and frameserving with AviSynth alwasy the same thing. This has happened to me with every avi I have tried to convert and I'm lost. I've tried lot's of solution for fixing audio sync, but my audio is coming out the right length so it doesn't help.

Anyway considering how many people use CCE there has to be some way to fix this issue and any suggestions would be apreciated. Interestingly CCE correctly reads the number of frames and when you multiply the frames by 23.976 you get the right length, but the encoded video comes out short.

please help

[RoopeT]

A friend of mine had similar problem with his captured avis. Apparently some frames are not fully captured and CCE skips those frames when encoding and thus introduces synch problems.

This problem can be fixed with Avisynth.
I can't remember the exact solution, but one of the following should help:

1) Avisource("myvideo.avi")
AssumeFPS(23.976)

2) Avisource("myvideo.avi")
ConvertFPS(23.976)

3) Avisource("myvideo.avi")
ChangeFPS(23.976)

Just test the above scripts and see which one works.

[Cuchulainn]

Cool.

Thanks for the response, I'll give it a try and post my results (incase anyone else with this problem finds the thread)

[Cuchulainn]

Hmmm, no luck.

I tried AssumeFPS first and nothing. I tried ConvertFPS (has to go after ConvertToYUY2) and same problem the video is 3 seconds short. I'll keep plugging away, any further input would be apreciated.

[Cuchulainn]

Still no luck, but one more piece of info. If I play the file in Windows Media Player it's fine. If I use even a oneline AviSynth script to play the file in WMP it's out of sync. AVIsource (myavi.avi). But if I use DirectShowSource (myavi.avi) it's fine. Unfortunately if I pass it to CCE with that script it's still 3 sconds short. Not sure what it might mean but I'd thought I'd post anything I learned incase it means something to someone else.

[Jeremiah58]

Just in case that you haven't tried this yet:
Open your avi in Virtualdub, or better in Goldwave, and save your audio as wav.
Use this wav as audio source for your encoder.

[Cuchulainn]

I have tried extracting the audio as a WAV in VirtualDub, the audio was VBR mp3 so that was my first attempt. The audio is coming out at the right length once extracted and encoded as AC3, the problem seems to just be the video stream which seems to be a lot less common.

Thanks for the idea though. All sugestions greatly apreciated.

[Jeremiah58]

I do not use CCE, just wonder is it worth the trouble with so many other encoders?

[Cuchulainn]

Hmmm, suppose you have a valid point. I went with CCE because the majority of people seemed to agree it was the best for MPEG2 encoding. Since so many people use it well, I hate to give up. I must just be missing something simple. Oh well might try something else for now and just keep playing with this, I'll post if I figure it out.

As always, any suggestions would be appreciated.

[Ennio]

Can it be that you haven't the proper avi decoder installed?

cheers

[Cuchulainn]

Nope. Pretty sure I have the right codecs installed. It plays well and in-sync in avi form, which I take for confirmation of this belief.

Thanks for the idea though.

Just an update, the problem is pilot error and not CCE. If I use Diko they come out fine, but not if I do it manualy. I just have a silly aversion to one-click solutions and like a little more control. I will continue to play with the manual methods as time permits and post if I figure it out.

If anyone else has an idea I'm still all ears.