How to convert XviD @ 20fps -> (S)VCD compliant MPG?

[DRP]

I happily convert 29.97/23.976 & PAL 25fps AVI files to (S)VCD all the time with no problems whatsoever, but this is a new one for me and I'd appreciate some help.

The source XviD is at 20fps and yes you read that right... 20.000 fps. This is the first XviD/DivX file I've come across with a frame rate significantly different to the three frame rates mentioned above so I don't know how to handle it. I don't know why it has ended up at this bizarre frame rate but it plays fine in MPC and the sound isn't out of sync or sounding too fast or slow. There is a hint maybe at the beginning of the film where a message appears that says "The following film has been significantly modified from its original 3D presentation. Many images have been reformatted for 2D viewing".

I don't know the ins and outs of the difference between 3D and 2D video but maybe this has something to do with the 20fps frame rate?

Anyway, I would like to convert this to PAL 25fps. Does anyone have any bright ideas as to how to accomplish this without obviously making everyone sound like chipmunks?

Can I just perform a normal NTSC telecine on the 20fps to bring it up to 25fps? If so, what AviSynth script would do that?

Thanks for any help offered.

[Abond]

Yes, I think you can apply pulldown 20 -> 25 fps with DGpulldown utility
You don't need to change framerate in avisynth

[DRP]

This program takes a progressive MPEG2 video elementary stream, and applies pulldown flags to change it to a higher legal MPEG2 output frame rate

Sorry, but I don't see how this is gonna help. My source is XviD not MPEG2. I do want to convert it to MPEG2 ultimately for burning to DVD, but I have that part under control as long as I can just get the TC done during the encoding from XviD -> MPEG2.

[Baldrick]

You convert it to 20 fps mpeg2 and then add the dgpulldown so it will play at 25fps....but I don't know if it will work on svcd.

[Abond]

Irrelevant, sorry.

[Cornucopia]

Does it run right at 20fps?

If not, use one of the AVI framerate changing utilities on the net to fix it. Or pass it throught Virtualdub with modified frame rate (to a temp HuffYUV file or something)

IF so, convert in Vdub to 25(PAL) or 29.97(NTSC) and save as HUFFYUV, then encode to MPEG2.

Scott

[ronnylov]

Will this pulldown method really make a DVD compliant mpeg2? I thought PAL DVD was specified to be 25 fps and nothing else.

Regarding Avisynth you may try this:
http://forum.doom9.org/showthread.php?s=&postid=615027#post615027

I wanted to convert 15 fps to 50 fps (I have not tried it yet) but I guess this method should work with any framerate conversion.

[DRP]

Does it run right at 20fps?

yes it does

IF so, convert in Vdub to 25(PAL) or 29.97(NTSC) and save as HUFFYUV, then encode to MPEG2.

Scott

thanks, I'll give that a look

[DRP]

You convert it to 20 fps mpeg2 and then add the dgpulldown so it will play at 25fps....but I don't know if it will work on svcd.

I use TMPGEnc as my MPEG encoder and there's no option in TMPGEnc for making a 20fps MPEG.

[DRP]

Does it run right at 20fps?

IF so, convert in Vdub to 25(PAL) or 29.97(NTSC) and save as HUFFYUV, then encode to MPEG2.

Can I just frameserve the output straight into TMPGEnc instead of saving as HUFFYUV?

[Cornucopia]

I would assume, but I'm not so sure it would do so correctly when having to generate new in-between frames (remember the intermediate file/frameserve to be encoded would be 25/29.97 fps).

Frameserving is nice, but I've got the space and would rather have an intermediate file that I can fall back on (without re-frameserving) and check, should something need redoing.

Scott