Slow motion

[Jerzy Drozda jr]

Check out my first tutorial that i ever did. Pretty old one, but I hope it will help at least a bit.

https://maltaannon.com/after-effects/slow-motion/
Good luck.

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maltaannon.com – Free After Effects Video Tutorials and more

[Kevin Camp]

a very easy way to get pretty good looking slow-mo footage from interlaced material is to just apply time-stretch. it also renders very quickly…

1. select your footage in the project window and choose file>interpret footage>main… make sure the footage is set to separate fields with the proper dominance and you will probably want to check the ‘preserve edges’ option.
2. drag the footage to a new comp, if the destination frame rate will be the same (i.e. 29.97) the duration of the new comp should be double the length of the footage. if the frame rate will be different, you can calculate the new length by dividing the filed rate (29.97 fps has a field rate that is double the fps, so 59.94 fields/sec) by the destination fps.
3. with the footage selected in the new comp timeline, choose layer>time>time-stretch… and enter the amount to stretch (if keeping the same frame rate, 200%, if using a different frame rate, use the percent calculated for the new duration in the previous step.)

you are limited in the rate of slow-motion using this method. you will be forced to use the rate calculated by dividing the original field rate by the destination frame rate. usually that amount is 200% (or half speed), but if you were converting, say, 29.97 interlaced footage to 23.976, your amount would be 250%.

you may also get some field artifacting on edges (jaggies). enabling frame blending (select footage, then choose layer>frame blending>frame mix) and hitting turning frame blending on for the preview (button on the timeline) will usually help, but some artifacting may still be visible. there are other plugins that can help with t he deinterlacing, like re:vision’s fields kit.

Kevin Camp
Designer – KCPQ, KMYQ & KRCW