Understanding stutter in footage?

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  02 February 2017
Understanding stutter in footage

I'm wondering why this happening in some animations and not others. (3d rendered)

Same framerate (24fps).
Same renderer.
Same workflow.

Some footage is smooth.
Other is stuttering and unacceptable.

I guess it is the overall pattern (textures, forms, etc) the scene is making on the screen that make the eye perceive the jumps between frames (especially at 24 fps).

Or what is it?
Should I give those stuttering shots altogether and made others from scratch?

Any discussion on this topic, and how to fix it?
How to understand why it happens in the first place?

Thank you.
  02 February 2017
Are you talking about the strobing one could see on fast moving objects?

If so, it is basically more noticeable on objects moving horizontally across the screen because of the scan that happens every frame. You can see it also in cinema shot on film. It's part of what they call cinematic look I guess.
Lazhar Rekik
  02 February 2017
Thank you very much for your input lazhar.
It is the camera sliding, not so fast, but horizontally actually.
And yes, it is quite like strobe effect if I understand correctly.
  02 February 2017
Thats the idea of higher frame rates like 48 or 60 fps.

IMAX films are a good place to notice this issue (if not compensated for).

Here is a little on-line visualizer.
  02 February 2017
Thanks a lot circusboy, that's the kind of article I was searching for.
I'll read it as soon as I have a little moment.
  02 February 2017
Ok, so I read the article, very interesting.
Sadly, it's problematic since I have to add motion blur to my footage if I understand correctly. But it is an hero shot and I have to get all that what is in frame perfectly clear, so I guess I have to abandon this one.
Or I may render at higher 48 or I think 60 fps but it'll take forever.

Anyway, thank you again all.
  02 February 2017
The article doesn't do a very thorough job of explaining why motion blur is necessary. All motion film will have motion blur. It's a normal and expected quality of film. Motion blur occurs when something is moving while the film frame is still exposed to light. The more movement (the faster the movement) that occurs within 1/24th a second the greater the blur. So if something moves horizontally into frame and stops in mid frame, there will be a lot if blur then none by the time the object of focus stops. When something is not moving there should be no blur.

It will significantly improve your problem, but it takes an investment of time to understand and set up properly.

  02 February 2017
Originally Posted by boumay: But it is an hero shot and I have to get all that what is in frame perfectly clear, so I guess I have to abandon this one.

Actually motion blur is an industry standard for mimicking realism. Non-blur stands out as (too) CG.

So if by 'hero shot' you want as 'realistic as possible' than motion blur *is* what you should consider.
Just stop a frame on a pixar film sometime. MB is there unless *nothing* is moving (and this includes the camera).
  02 February 2017
Thank you both for the last posts, you convinced me to add mb.
  02 February 2017
When watching live sports on TV, the jittering can be annoying. Someone told me that back in the days before digital TV, jittering was unheard of on live stuff.
I like to learn.
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