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# Converting between AE & Premiere speed ramps

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 Converting between AE & Premiere speed ramps on Oct 25, 2013 at 9:55:49 pm

So After Effects Time Stretch works on a scale that seems to be the complete opposite of Premiere's Speed/Duration. In AE, a Time Stretch of 50% plays back twice as fast. While a Premiere Speed of 50% plays it back twice as slow. (So AE 50% = PP 200%)

Is there an easy formula to convert between the two? For example, I have a pre-rendered Premiere clip that is sped up 156%. What would be the time stretch value in AE to get the clip back to 100%?

 Re: Converting between AE & Premiere speed rampson Oct 26, 2013 at 1:14:56 am

I think this will work:

Divide 100% by the Premiere speed factor to get the stretch % for AE.

So if your Premiere speed factor is 200% then it would be like this:

100/200=.50

So you would enter a stretch value of 50% in AE.

100/156=.64 (rounded off)

Stretch factor in AE of 64%

The problem you may run into is that I believe there will be frames missing when you stretch the clip out again.

Erik Waluska
EAWmedia