18 fps transfer

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paul
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18 fps transfer

Post by paul »

Hello,

I have a few more questions:

If I expose my film at 18 fps and have it transferred by the workprinter I will have to slow it down afterwards. But in what kind of quality will this result. I want to buy a bunch of super 8 film for my coming travel (15 cartridges I think). At 24 fps I got 37,5 minutes. At 18 fps I got 50 minutes; that's a difference of five 24fps cartidges!! How noticable will the difference be. Will it be wothwhile. What are your experiences?

Paul
mattias
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Post by mattias »

duplicate every third frame (set speed to 75%) and you get 18.75 fps, which is close enough and results in minimal strobing/jerkiness. trying to get exactly 18 fps means you have to use a complex pulldown scheme which will probably look weird...

/matt
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MovieStuff
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Post by MovieStuff »

The other option is to use a product called Motion Perfect, which can be found at

http://www.dynapel.com/private/mp_video.htm

It does a pretty cool job of creating artificial frames to stretch the 18 frames out to 25. It can occasionally create some odd side effects, depending on the nature of the footage but, in general, I've been impressed with what I've see so far. It's cheap ($49) but apparently takes a loooooong time to render.

I think there are other products out there that will do similar things and probably some that will do some simple interpolation of fields that might render faster.

Or you could just shoot at 25fps and take advantage of everything that PAL offers that WE IN THE UNITED STATES WITH OUR STUPID NTSC SYSTEM CAN ONLY DREAM ABOUT!!!!!

Sorry. At least I'm not bitter about it.

Roger
jukkasil
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Post by jukkasil »

Paul wrote:

"If I expose my film at 18 fps and have it transferred by the workprinter I will have to slow it down afterwards. But in what kind of quality will this result. I want to buy a bunch of super 8 film for my coming travel (15 cartridges I think). At 24 fps I got 37,5 minutes. At 18 fps I got 50 minutes; that's a difference of five 24fps cartidges!! How noticable will the difference be. Will it be wothwhile. What are your experiences?"

Here is one example, how I do that same thing with my Workprinter (3) and Canopus speed controller program:

The original transfered clip without any modification to speed (shot with 18 fps):

http://www.sorb-i-tol.com/huvipuisto1.mpg

After I slowed down (with Canopus speed controller) using 72 % settings (--> 18/25 = 0.72), now speed is the right one:

http://www.sorb-i-tol.com/huvipuisto1hidas.mpg

That speed controller program is very good one (and it's free, but only suitable for Canopus cards, I think). I use that method all the time without any problem.
Best Regards

Jukka Sillanpaa
mattias
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Post by mattias »

jukka, the problem with slowing down by 28% is that you get a lot of frame blending, and/or irregular duplication of frames. your footage looks very good, but the frame blending is obvious in some places, and it's still not perfectly smooth. have you tried slowing down by 25% instead and maybe turning the frame blending off?

/matt
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