Linear speed in graph editor

[Tudor “ted” jelescu]

Changing the speed on your animation will not necessarily reduce flicker. Here are a few things that usually do the trick:
AE motion blur (give by the layer’s movement, with adjustments to the motion blur settings)
A .3 to .7 blur applied to the animated layer
OR CC Force Motion Blur (again, play with the settings)

Tudor “Ted” Jelescu
Senior VFX Artist

[Toni Martin dobrzanski]

Hi Tudor

Thanks for your answer. I already put “Reduce Interlace Flicker” filter on (0.5) and Fast Blur (0.3). I just need to be able to control the speed of my motion since the movement has to be a whole amount of pixels per frame.

Do you know how to do this? Control the speed so it’s constant? I can’t make it work in the graph.

Thanks!

Toni Martin Dobrzanski
Film Composer / Video editor/photographer
SoundComposer – Denmark

[Esky Ching]

In “Preference” you can set spacial interpolation to “linear”

[Tudor “ted” jelescu]

By definition, if you have 2 linear keyframes only you will get constant speed. If you need to change the speed you will adjust the time in which the animation happens – you can change the position of the keyframe in the timeline for that, no need for the graph editor.
If you get bezier handles in the graph editor when you move a keyframe, you can always select that keyframe and use the check boxes at the bottom of the graph editor interface to convert back to linear.

Tudor “Ted” Jelescu
Senior VFX Artist

[Walter Soyka]

[Toni Martin Dobrzanski] “So how do I change the speed of a movement between two keyframes and keeping it at a constant px/sec (for example 200 px/sec)?”

For a smooth credit roll, we don’t care moving at a round number of pixels per second — we care about moving a round number of pixels per frame (and if you’re using interlaced video, an even number).

You can use the following expression to get a smooth scroll. Alt-click the position property stopwatch, and enter the following expression:
speedPxPerFrame = 2;
currentFrame = (time - inPoint)/thisComp.frameDuration;

value - [0, currentFrame*speedPxPerFrame]

Expressions are evaluated every time a frame is rendered. This expression gets the x and y positions as defined by the layer’s position property, then subtracts 2 pixels from the y position for every frame that’s happened since the layer’s in point. You can change the speed of the roll by changing the value assigned to speedPxPerFrame.

You can also manually adjust the layer’s position point to change where it will begin (just don’t add keyframes to the position property — you’ll get unexpected results).

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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[Toni Martin dobrzanski]

Thank you all! Your posts have been very valuable 🙂

Toni Martin Dobrzanski
Film Composer / Video editor/photographer
SoundComposer – Denmark