20 FPS AVI to SVCD -- Help !!

[Ripper2860]

I have an AVI file that was encoded at 20fps using MS Mpeg4 codec. It plays fine and the quality is pretty good.

I used DVD2SVCD and CCE 2.5 to conver to SVCD mpeg and while the quality of the video is great -- you can tell the video is running a little fast and the voices are higher pitch and faster -- although in sync with video. I am sure it was probably the fact that it re-encoded at 29.97 FPS (NTSC). If I use TMPEGenc w/NTSC film the situation is better but the video and audio are not quite in sync.

I wish to play this file as an SVCD on an NTSC TV. Should I / Can I convert the AVI so that the resulting MPEG is also at 20FPS? Would it play on my TV via a DVD player? Any suggestions on the best way to accomplish this? Is there a tool to "force" playback at 20FPS via an alteration of a file header or something similar that would not require re-encoding?

BTW -- the quality of the file with DVD2SVCD and CCE using D2SRoba and 1 one pass variable setting is great. If at all possible, I would like to do this with these tools. However -- whatever it takes.

Thanks for any assistance !!

[AngusMacGyver]

I think you can do this with avisynth. In my opinion, you can do a trick by repeating a field in each frame (upper, bottom, upper, bottom...) You will have 3 fields instead of 2 and 30 fps instead of 20. It's my theory, but I think it can work. After that you will slowdown from 30 to 29,97 fps.

[Ripper2860]

AngusMcGyver,

Thank you for your reply. I would like to give your recomendation a try -- but I'm afraid AVISynth is not something with which I am very familiar.

**One of the reasons I like DVD2SVCD is that it somehow makes me appear to know what I am doing. **

I poked around looking for an example filter to ADD frames, but have not come across any. Do you know of one or could you post up an example? I consider myself a smart person and given a start could probably work through it.

Thanks !!

Richard