Shooting 24fps straight or Shooting 30FPS then play at 24FPS?

V

vincent thomas

Well-known member
Anyone care to comment about this? Until now i have done only the first solution. I have heard it worth trying to shoot at 30FPS (i guess with a shutter or 60fps?) then play the resulting footage at 24fps. Obviously the sound track has to be treated differently here...

What will look more "filmic"? if it's make sense to tell it that way..?
Is it possible that on you get different feeling doing that when shooting on a GH2 then on a 5D II despite the obviously difference we already now, im mostly speaking here in term of motion feeling...

Cheers guys


v*
 
What effect are you trying to get at? Footage shot at 30 frames per second and played back at 24 frames per second will be in slight slow motion, unless you throw away 20% of the frames (and then it will have a jerkiness that probably won't be all that attractive).
 
But isn't converting 24p to 30p quite a bit different from the other way around (converting 30p to 24p)? I haven't seen any instances of the latter. It just doesn't sound like it would be pretty at all, though.
 
Let's clarify that "converting" vs. "playing as" are two different things:

"Playing as" means you will map one frame of source footage (say for example 24) to a destination frame rate (ie 30). Since these are 20% different from eachother, you get a 20% speed difference. Same as if you shoot 60p and play back 24p, you get 2.5 times slow motion. You shoot 12fps and play 24fps you get double speed.

"Converting" normally means you want some fps footage to play as another. Going to a higher frame rate is accomplished often by blending some frames to create "missing" frames. When you watch this footage it looks normal, but if you play it back and examine one frame at a time you will see that some frames are actually mixes of two frames!

Going the other way around 30p to 24p is different. You have more samples that you somehow need to mix together to result in less frames. If you just skip frames you will get jerky looking footage (like the girl from the well in the movie "The Ring".). The best way is going to be a combination of blending many frames, but this will almost always give you something that looks like motion blur but more like a ghosting effect.

My advise is pick one frame rate, know why you picked it, then shoot with it and don't look back!!!

FYI: some interesting articles on 30p to 24p:http://philipbloom.net/2009/05/30/how-to-convert-canon-5dmk2-footage-from-30p-to-24p/

AE has great options, also some plugs available if you are Final Cut Pro guy: http://nattress.com/Products/standardsconversion/standardsconversion.htm

YouTube example of different 30p to 24p methods: http://www.youtube.com/watch?v=YdZMAKjAF30
 
KMR said:
But isn't converting 24p to 30p quite a bit different from the other way around (converting 30p to 24p)?
Click to expand...

No. They're both usually problematic for exactly the same reasons. The process is slightly different, but the math which produces the poor result is the same.
 
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