Motion-Blur not working on transition effect

[John Cuevas]

Motion blur only works on layers that have motion…rotation, scale or position. AE actually calculates the motion of the layer to determine blur.

You can use the effect Time_CC Force Motion Blur. This effect creates motion by looking at past and future frames to create an approximate motion blur.

Johnny Cuevas, Editor
Thinkck.com

“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.

[Todd Kopriva]

The new Pixel Motion Blur effect is a good way to synthesize (fake) motion blur.
https://provideocoalition.com/cmg_keyframes/story/pixel-motion-blur-in-after-effects-cc

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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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[Kevin Camp]

you can also fake it with a blur effect.

if the movement of the jaws is simply vertical or horizontal and since you only want to blur the alpha channel (the jaws reveal), i’d use channel blur, setting the blur dimensions to horizontal or vertical and enabling the repeat edge pixels option.

if it’s any other direction then you’ll want directional blur. since directional blur blurs all channels you’ll need to add an effect called cc composite with default settings, which will put the original (non-blurred) rgb image back in place while maintaining the blurred ‘jaws’ alpha.

Kevin Camp
Art Director
KCPQ, KZJO & KRCW

[John Cuevas]

So you get that all sorted out?

Johnny Cuevas, Editor
Thinkck.com

“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.