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Where Are My Frames Going?
This is a question which involves importing a JPEG sequence.
I have a composition which is made from 984 frames. I have imported them as a JPEG sequence and my composition is HD1080p 24fps.
So the math was easy to begin (984f / 24fps = 41sec). I simply set my sequence interpretation as 24fps and then placed the sequence in my comp.
Well after messing with it for a few minutes I decided that it was a little TOO long at 41 seconds so I wanted to make it shorter.
My first instinct was to use “time remapping” and force it to wherever I wanted.
But then I thought – Why not just make the interpretation a faster frame rate?
So I set the new frame rate for 72fps. This dropped me down to about 13 seconds which was nearly perfect.
My question is this: Where did all those extra frames go? If my comp frame rate is still 24fps?
If I am now at 13 seconds then what has happened to about 600 extra frames? Since (13sec * 24fps = 312)
Does AE eat them? Throw them out? Does it do some kind of interpolation?
Just curious.
Thanks
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2 Replies
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Think of it this way:
The source footage item is an image sequence. The composition contains a layer that refers to that footage item. At each frame in the composition, the layer asks its source footage item for a frame for the corresponding time. If your composition frame rate is 24fps, and your footage item frame rate is 72fps, the layer is only asking the footage item to provide one frame in three.
So, your frames aren’t “going” anywhere. You’ve just set it up so that the composition isn’t using them.
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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So it they are getting “thrown out” for the final export.
I was just about to set up a test to see if they were somehow still used.
Thanks.
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