Tuesday, October 30, 2012

after effects slow motion warping

after effects slow motion warping

after effects slow motion warping
As a recent convert to Adobe Premiere one of my favorite discoveries is the Rate Stretch tool. It allows you to visually pull the length of a clip to fill how ever much time you need, then immediately preview the results. As someone who uses a lot of b-roll and slow motion in his filmmaking this tool is a serious time-saver. (check out the video after the jump)
The only problem with the Rate Stretch tool is the quality of the motion quality. In order for Premiere to slow the clip down it has to create new frames, and the more you slow it down the more frames Premiere has to create out of thin air. Premiere does a decent job of this, but most of the times I need a lot better than "decent" - I need "amazing".
In order to get great results you need something like Pixel Motion (within After Effects) to really get top-quality slow motion. In the past that meant slowing the clips down in Final Cut, exporting them into AE, applying the effect, exporting them back into FCP and hoping I guessed right on the slow down rate. 
(if not, I get to repeat the whole process again)
Enter Dynamic Linking...
Using Dynamic Linking allows you to spend 98% of your time working in the editor, actually crafting stories. (you'll need the Production Premium suite to rock this) Here's the workflow -
1. Edit your entire sequence in Premiere; use the Rate Stretch tool to get the slow motion clips where you want them. (don't worry about the playback quality at this point)
2. Right-click the clip you've slowed down and select "Replace with After Effects Composition". After Effects will automatically open with a new project based on the clip.
3. In After Effects timeline click the "Enables Frame Blending on all layers with the Frame Blend switch set" button to enable frame blending (pictured below).
4. Next, click the Frame Blend radio button twice so the line becomes solid. This tells AE to use Pixel Motion high-quality frame blending.
5. Hit "Save" in After Effects.
6. You're done! Head back over to Premiere and your changes will be reflected in the clip on the sequence timeline.
Depending on the power of the machine you're editing on you should be able to immediately preview the improved frame blending. The great news is that you don't need to render, at all, until you're ready to do your final render in Premiere. It's that simple.
This technique can be used for a number of different operations like color grading and noise reduction. I personally prefer to do most of these processes in the editor itself; high-quality time stretching just isn't possible at this point without After Effects. Check out this video to see the difference in quality -
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