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Force motion blur problem with upper field.
Hi!
I’m making a comp where there is some accelerated video footage. To disimulate this and make it look like it is not accelerated I added CC force motion blur to the video.
it works perfect but when I export it, the export somehow turns the force motion blur effect off.
I tried it by adding an adjustment layer on top of the footage with the effect and also by adding it individually to every layer, but still it dissaperas in the render.
I came to notice that this only happens when i set the export to have the upper fild first. if it put it in progressive the effect works.
What can i do? since i need the exported footage to have upper field to match the rest of the film? -
18 Replies
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Assuming you’re working in NTSC: render your animation at 60fps, then reimport it into AE, drop it in it’s own comp, change the frame rate to 30 and render with fields.
For PAL you’d render at 50, then fields at 25.
(Or with drop frame NTSC it’s 59.98, then 29.97, etc)That’s a weird error, by the way. Never heard of it before. But, then again, never tried it before, so….
Ben Unguren
Motion Graphics & Editing
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I’m in PAL so I exported it at 50 and progressive.
weirdly enough, the effect was oof this time aswell.
looks like it dissaperas when i set field dominance (not progressive) and even wehn i change the framerate.
Must be some weird bug in the effect. -
It sounds like you are just using force motion blur to blend frames… You might try using frame blending (frame mix) and see if it works for you.
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW -
I tried that, but the frame blending only works for slowed footage. when I apply it to accelered footage it doesnt change a thing. That’s why i use the force motion blur fx, to simulate that objects are moving at a faster speed and to hide the fact that it is accelerated.
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We are looking into this. Please contact us at support cycorefx.com
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ok!
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Ok I have tried to reproduce this with both the bundled version and the HD version but can not reproduce this.
The only way I can see the effect not producing anything is if I use 50 fps footage (which is correct since interlaced frames in PAL is 50fps as well).
What framerate does your progressive footage have?An alternative method could be to use CC Wide Time on the source footage instead.
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The original footage runs at 25 fps with upper field dominance. So, i’m making the export look just the same.
I mentioned progressive footage cause i founf put that exporting in progressive keeps the effect there. I haven’t tried to revert the filed dominance in the export. like setting lower field. but that isn’t gonna help since I need it in upper. -
When you say “… some accelerated video footage.” what exactly do you mean?
Force Motion Blur does not synthesize motion blur, it blends intermediate frames into a single frame to generate the motion blur. If your source footage does not contain any intermediate frames then there will not be any effect. What you are seeing on progressive frames (eg. comp window) is most likely the deinterlaced fields being blended. When you then render interlaced there won’t be any further intermediate frames and thus no effect.
If you footage does not contain the necessary intermediate frames you may use AEs (CS5 or higher) high quality frame blending to provide synthesized frames for Force Motion Blur to use but it must then be applied as an adjustment layer. -
That’s iteresting.
yes, I actually don’t know how the effect works.
what I mean with accelerated footage is video footage set to last half it’s duration. So, it’s speed is doubled. If it’s a guy running then he runs faster. But when you do just that you can tell he is not really running at that speed cause he has less motion blur than he should have if the footage was naturally like that. So using CC Force motion blur over that layer adds the amount of MB it should have making it more natural to the eye. I’ve checked and works both ways: using the effect in the layer and also in a adjustment layer.When Kevin suggested using frame blending I tried that. It didn’t make any result in the footage. It was the same if the FB icon was on or off. We can tell that it works with footage slowed down on AE, but when it’s made to last less time it doesn’t seem to do a thing.
so, that’s the problem basically. I accelerated footage on my composition and want to make it look like it was filmed at that speed by adding motion blur.
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