3:2 pulldon question

[malducci]

I had read up on this a bit, but I'm a still bit confused on wheather the program will detect if there are 24fps in a 29.97fps video before appling the change or do you need to know before hand when applying this tool? If you do need to know first, that your 29.97fps video is actually 24fps, then what tool will detect this?


thanks

[Randy64]

If the video is avi or mpeg1, you can open it in vdub and look under file / file info and the size and fps will be listed, along with other details.

If the video is mpeg2, you can use DVD2AVI and use the preview option.

Hope this helps,
Randy

[damnim]

DVD2avi will detect the type of film that you wish to encode. Here is a good illustration and simple instructions on how to use it, what to look for and how to set DVD2avi. http://www.flexion.org/video/DVDConv/DVD2AVI/dvd2avi-type/

In the illustration you see a window called the statistics window. This window displays the imfo about the film as you preview it.

[malducci]

The file is an uncompressed AVI at 29.97 FPS. I suspect the original frame rate to be 24fps, but was converted to 29.97 before I captured it. I should move this over to the part of the forum, since the question does not actually cover capturing.

Sorry

[damnim]

malducci

Well the question is on the border. Appreciate your consideration

Back to the main question. If DVD2avi during a preview of your source is indicating that it is 100% NTSC then encode it that way. If your getting mixed readings during playback like film 90% then you want to set DVD2avi in a forced film mode.

I haven't tried this yet, but I'm going to try a method posted here earlier using the 3:2 pulldown settings and see if they work.

I'm like you I need a little more satisfactory explanation on the Forcedfilm in DVD2avi frameserved to tmpgenc and telecline. I'm getting mixed imformation about this.

I've heard that most DVD's are encode in the 24fps with a flag and the player automatically adjusts it to 29.97. However, every DVD that I have worked with so far are showing 29.97fps from the vobs. So, until I find out exactly for myself what is going on with this, I will stick with how I am doing it.

[w00kiee]

if a dvd is 24 fps with the repeat first field flags added so it is essentially a 29.97 fps vid.. instead of 2 frames that look the same it just uses 1 frame and a flag that says the last frame should be repeated. so its physically 24 fps but is played pack at 29.97 fps (which is what your tv wants

most apps that check the fps will report 29.97 unless they scan the file and see the Repeat First Field flags and deduce its 23.976 faked to look like 29.97... tff/rff is acceptable for mpeg and all dvd players will handle it correctly(or at least should) .. just remember the flag is not one flag at the beginning of the film... the flag is added to 12 fields (so in playback 12 fields are played twice) so you have 24 fps x 2 fields = 48 fields.. to get to 60 fields/s (ntsc) you have to add 12 fields.

why waste bitrate on the same frame when a few bits can relay the same data

since there are 60 fields/s to deal with the video is labeled as 30(29.97) fps... even tho there are just a bunch of flags possing as frames

[damnim]

Thanks w00kiee

What your saying is confirming my research into the matter.

Da! If I can encode at a pulldown It will be less bytes on the disc. Less bytes to burn and more room on the DVD-R for other goodies.

Time to experiment. So far I haven't seen any guides that even deal with the issue of these flags.

[w00kiee]

well.. basically.. you can use less total bitrate to acheive the same quality... orrr you can use the same bitrate and get BETTER quality.. which is what I do... 2400 kbps @ 24 fps == 100 kbits per FRAME while 2400 kbps @ 30 fps = only 80 kbits per frame .. for no good reason.. besides that 24 fps encodes faster!