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kamil6788
Participant
April 21, 2020
Answered

vertical lines flickering after render

  • April 21, 2020
  • 1 reply
  • 1851 views

Hi,
my animation after render has a flickering/not smooth looking problem. It concert vertical lines mostly but most of objects has more or less problem with it.
this is part where problem is the biggest

https://www.youtube.com/watch?v=CHkYXF-DnGg

 

here is h.264 *.mp4 render but quicktome .*mov ware excatly the same. 25 fps 1920x1080

I dont know how to name it so i can't find the answer anywhere.

Any ideas?

thanks

This topic has been closed for replies.
Correct answer Martin_Ritter

What you are experience are jittering lines - that's the same problem when it comes to rolling credits.

 

So, basicly the amount of pixels the lines are travelling from right to left is to much to result in a smooth motion, and chances are high that you are not moving in full pixels per frame, but fractions of that. This result in anti-alaising and blurry edges.

The artwork itself, with it's hard contrasts, add up to the problem.

 

To resolve this, or at least make it less jitter, you can:

- retime the scroll, so it moves slower and in full integers per frame - like 20pixels/frame (you can see this in the speed graph)

- increase fps, so you effectivly moving less pixels per frame

- add motion blur or directional blur - downside: blurred edges

 

Those will help, too, but will change the look and feel:

- reduce contrast in artwork

- add grain

 

To be honest, the jittering isn't that bad. If you pay attention you'll see this everwhere, all for most in cinema.

But to fix this, I would retime the animation to a fast scroll into the room, followed by a very slow scroll through the room, followed by a fast scroll and repeat. This will also fresh up the animation.

 

*Martin

1 reply

Martin_Ritter
Martin_RitterCorrect answer
Legend
April 21, 2020

What you are experience are jittering lines - that's the same problem when it comes to rolling credits.

 

So, basicly the amount of pixels the lines are travelling from right to left is to much to result in a smooth motion, and chances are high that you are not moving in full pixels per frame, but fractions of that. This result in anti-alaising and blurry edges.

The artwork itself, with it's hard contrasts, add up to the problem.

 

To resolve this, or at least make it less jitter, you can:

- retime the scroll, so it moves slower and in full integers per frame - like 20pixels/frame (you can see this in the speed graph)

- increase fps, so you effectivly moving less pixels per frame

- add motion blur or directional blur - downside: blurred edges

 

Those will help, too, but will change the look and feel:

- reduce contrast in artwork

- add grain

 

To be honest, the jittering isn't that bad. If you pay attention you'll see this everwhere, all for most in cinema.

But to fix this, I would retime the animation to a fast scroll into the room, followed by a very slow scroll through the room, followed by a fast scroll and repeat. This will also fresh up the animation.

 

*Martin