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Premiere Speed % vs. After Effects Time Stretch Factor

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Marc NiborPremiere Speed % vs. After Effects Time Stretch Factor
by on Apr 23, 2015 at 7:33:14 pm

Ok, let's say I have a clip in Premiere and I adjusted it's Speed to 124%.
How do I find out what Stretch Factor setting I must use in AE to get exactly the same increase in speed?



The workaround I've used so far was by measuring the length and then directly edit the "new duration" setting. But this is getting extremely annoying if the clip in question has been trimmed already in Premiere.



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James StrawnRe: Premiere Speed % vs. After Effects Time Stretch Factor
by on Apr 23, 2015 at 8:23:23 pm

Just a guess, without actually being able to check it right now...
Inside PrPro, set the Clip/Speed Duration setting to the desired % and note the duration that it changes to inside that same dialog. Then in AE, make sure that whatever stretch factor you use yields the same duration. Make sure the frame rate is the same in both cases and it should work.

Software Quality Assurance - Digital Video at Adobe Systems


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Marc NiborRe: Premiere Speed % vs. After Effects Time Stretch Factor
by on Apr 23, 2015 at 8:34:12 pm

Thanks James, that's the workaround that I've used so far as described above.
This solution has a few downsides though, especially if the length of the clip has been trimmed.

I've used this workaround for years but there's got to be a real solution.



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James StrawnRe: Premiere Speed % vs. After Effects Time Stretch Factor
by on Apr 24, 2015 at 3:40:56 pm

Does it help your workaround at all to be able to apply the speed/change as a master clip effect, as opposed to only the sequence clip isntance(s)?

Software Quality Assurance - Digital Video at Adobe Systems


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Walter SoykaRe: Premiere Speed % vs. After Effects Time Stretch Factor
by on Apr 23, 2015 at 10:59:43 pm

[Marc Nibor] "k, let's say I have a clip in Premiere and I adjusted it's Speed to 124%. How do I find out what Stretch Factor setting I must use in AE to get exactly the same increase in speed?"

Stretch is the inverse of speed, so to get stretch, divide 1 by your speed percentage.

The Ae stretch would be ~80.6. Get it by dividing 100/124.

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]


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Marc NiborRe: Premiere Speed % vs. After Effects Time Stretch Factor
by on Apr 24, 2015 at 5:15:15 pm

Thanks for the suggestion James. Applying the speed change as Master Clip effect would work and is a solution to keep in mind for certain circumstances.

I think Walters solution is much simpler and faster in most cases.
It's actually exactly what I was looking for.
So, thank you very much Walter. ; )

One last question for Walter.
How do I need to change the calculation if I do it the other way?
Transfer from AE to PP? It's probably superobvious, but math was always a weak point of mine. TIA ; )



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Walter SoykaRe: Premiere Speed % vs. After Effects Time Stretch Factor
by on Apr 24, 2015 at 5:30:02 pm

[Marc Nibor] "How do I need to change the calculation if I do it the other way? Transfer from AE to PP? It's probably superobvious, but math was always a weak point of mine. TIA ; )"

Same exact relationship -- the reciprocal (or multiplicative inverse). Divide 1 by the number. Since we're dealing with percentages, mind your decimal places.

1 / 1.24 = 0.806 or 80.6%

1 / 0.806 = 1.24 or 124%

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]


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Marc NiborRe: Premiere Speed % vs. After Effects Time Stretch Factor
by on Apr 24, 2015 at 8:23:56 pm

Thank you Walter - now that I see it, it makes perfect sense.



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