Strange TMPG and 3:2 pulldown problem

[robbin]

After noticing some jerkiness on converted to mpeg2 23.976 avi's, and doing lots of reading about pulldown, I tested those mpeg2 files, and noticed that they have every third frame repeat, instead of what I understand should be the fourth (that is they have 1 2 3 3 instead of 1 2 3 4 4).

i used the standard NTSC film mpeg2 template in TMPG so I do not understand what is wrong. Btw, trying to check TMPG actual TELECINE capabilities, I choose the mpeg2 NTSC 29.967 template, and TMPG added the fifth frame correctly, that is creating the 1 2 3 4 4 structure.

Any ideas on what's going wrong?

Thanks in advance for all your help.

[puertorican138]

You should select the "SuperVideoCD (NTSCFilm)" Template in TMPGEnc. It uses 3:2 Pulldown when playback which should fix your problems.

[puertorican138]

What is 3:2 pulldown when playback???

3:2 pulldown when playback is used when you have a FILM source movie (23.976fps) to leave it 23.976 but have your decoder play it back at 29.976fps (works great for ripping DVDs). When 3:2 pulldown is used it does this.. It takes four sequential video frames (A, B, C, D) from the FILM and are drawn on the video display as A1, A2, B1, B2, C1, C2, D1, D2, where the 1 or 2 represents the field number within the frame.

Hope That Helps!!! :P

[robbin]

Thanks for your help guys, however I did use the svcd NTSC film template, which does uses the 3:2 pulldown and that's when i got the jerky playback.

I ran the svcd 29.976 NTSC template just to see how a defacto telecined file should look like so i can compare the results to the jerky NTSC film which only used the pulldown flag. And that's when I noted the difference in the frame repeat count. Anyhow that said let me refer you to a post I made later on which gave me some more insight on this issue.

http://www.vcdhelp.com/forum/viewtopic.php?p=444160#444160

[adam]

If you loaded the ntsc template than you did not do a telecine. By default, if your output fps is different than your source fps than TMPGenc will randomly repeat certain frames. Perhaps if the source is 23.976fps and output 29.97fps then it will duplicate on a 3:2 pattern anyway, but I doubt it. The reason is because TMPGenc has a specific filter for running an actual 3:2 hard telecine, check on the advanced tab.

[robbin]

Yes I am aware of that filter just seemed to misinterpreted the results, now that I actually did a quick test with it.