Why movies look weird at 48fps, and games are better at 60fps

Post by blakecaldwell » Thu, Dec 25, 2014, 2:27 AM UTC

baddox wrote: post #87

blakecaldwell wrote: post #28

Earlier quoted context omitted.

Not sure about how movies are filmed, but you don't have to shoot video frames at 1/FPS. That's just the slowest you can shoot. If you're shooting in broad daylight, each frame could be as quick as 1/8000, for example. Shooting at the slowest shutter speed possible should make the most fluid video.

I'm pretty sure that 24 FPS footage with a 1/24 second shutter speed would be completely unusable except as an extreme blur effect.

Post by KayEss » Thu, Dec 25, 2014, 5:22 AM UTC

Arelius wrote: post #86

samatman wrote: post #33

Earlier quoted context omitted.

The corollary is that it should be possible to produce a movie-like quality in games, by over-framing and compositing a blur between frames. The result would have actual motion blur and update at say 30 fps, but without the jerkiness we normally associate with that frame rate.

Sure, if you can render at so 120 hz, or more and composite the 4 frames together into your single frame you will get a single improved frame. but even at 4 renders a frame you'll still get artifacts, I imagine you'd need at least double to make it worthwhile, But even that only gives you ~8ms to time step and render the entire scene. Minus composting and any other full-frame post effects. And hitting the ~16ms requi…

Post by KayEss » Thu, Dec 25, 2014, 5:38 AM UTC

stephenboyd wrote: post #68

cpeterso wrote: post #56

Earlier quoted context omitted.

Did your friend say what frame rate Pixar uses for its animated films?

Last year, I was told by one of the technical managers for animation at Pixar that they're all in 24 fps. They've used all the increased processing power since their founding in the 90's to increase detail, so the result is that the time it takes to render each frame has barely changed since Toy Story. Each frame of Monsters University took an average of 29 hours to render. This article has some good info: http://ven…

Post by darkmighty » Thu, Dec 25, 2014, 6:15 AM UTC

Retra wrote: post #97

carlob wrote: post #82

Earlier quoted context omitted.

Another way of say of saying this is that a drum beat has no definite pitch because it's too short. It's exactly the same property of Fourier transforms behind the uncertainty principle.

There's also a broader picture -- that this effect arises because we use discrete, independent words to describe inter-dependent phenomena. The concepts of momentum and position are not good 'factorizations' of reality, so trying to talk about it in those terms leads to structural problems when you increase precision. It's the same kind of problem you get when you try to talk about objective/subject morality, or whet…

Post by darkmighty » Thu, Dec 25, 2014, 6:25 AM UTC

danieltillett wrote: post #84

Retra wrote: post #30

Earlier quoted context omitted.

I always use this fact as a kind of analogue to explain position-momentum uncertainty in physics. From a blurry photo of an object, you can easily measure the speed, but the position is uncertain due to the blur. From a very crisp photo, you can tell exactly where it is, but you can't tell how fast it is moving because it is a still photo. It's a good way to start building an intuition about state dependencies.

If you know the direction of the motion of a blurry object isn’t the location of the object on one of the leading edges? I thought the problem was more that you have no idea of the features of the object?