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50i footage to 25p with ramped slow-motion
I have som 50i footage in which i would like some ramped slow-motion. (time-remapping) But when i slow it down just a little in after effects it gets laggy.
I’ve heard about seperating the fields, but it doesnt seem to work when using time-remapping.Any solution of making slow-mo of 50i footage?
PS: Sorry my bad english.
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3 Replies
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Have you enabled frame blending for both the layer and the comp it’s in?
Walter Soyka
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Yes. Frameblending is enabled. It makes it a little better, but still laggy. The weird thing is im slowing it down to like 40% at slowest. And i can find loads of clips on youtube filmed with same camera: https://www.youtube.com/watch?v=WW1Quhp8v28
Maybe its the shutter speed, i used around 1/500 but maybe its too fast?
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Hey there,
you can get instant 50% slow motion by deinterlacing the 50i footage.
Just interpreted as interlaced footage (depends on the source, but usually Upper Field first for PAL). Slow down to 50%. No frame blending and such.
But this will give you slightly aliased (jaggy) lines which can look horrible if you have plenty of horizontal lines in the shot.
Using a dedicated de-interlacing solution such as Re:Vision Fx Fields kit will help a lot.
Slow ramping might look jittery/laggy too.
For true optical flow time remapping you can use the Timewarp effect, (under Time) which is actually licenced Kronos plugin from The Foundry, but it comes with After Effects … it does the same as Twixtor, but I don’t think it’s as good.
It’s also very similar to what AE does when using high-quality frame blending, but with way more control.
You could still get artifacts, especially when slowing down non rounded numbers and slight slows (such as your 40%), i.e. not 1/2, 1/4, 1/8 speed etc.
Also you’ll have trouble slowing down things where image changes a lot from frame to frame and where motion overlaps. Strange things can happen on the image borders, too.
If you have more questions let me know.
Cheers
G
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