In addition, I tried a couple of other methods that I thought would give different results, and they did. I did the following:
(1) Created a new blank comp at 24 fps and dragged in the original 23.976 footage item from above.
(2) Dragged the original 23.976 footage item to the New Comp icon and then changed the frame rate in the Comp Settings to 24 fps.
Both of these methods gave identical results, and in the table below compare it to the 23.976/24 data shown previously.
What I looked at Previous 23.976 / 24 comp 24 fps Comp created as shown above My 2 pop frame 48 49 2 pop TC 2:00
A Particular Frame (image) 614 (FFOA) 615 (FFOA) A Particular Frame (image) 999 1000 A Particular Frame (image) 999 1001 A Particular Frame (image) 1000 1002 A Particular Frame (image) 8000 8009 LFOA 12469
12482 (again, there's my 13 extra frames)
LFOA TC 8:39:13 8:40:02
I'm not sure what Ae is doing here, but I suspect it is resampling, given that at about 1000, the new method creates a situation where a single frame is duplicated. This happens about every 1000 frames, consistent with the 0.1% time speedup from 23.976 to 24. Note that I do not have frame blend on, so it seems to be sticking to actual frames, just duplicating them as needed to keep things ... whatever.
This is, I think, definitely NOT what I want to do to get from 23.976 to 24. The original posts seems to be the right way, but I don't understand why it is the same length. I do know that I need to compress my audio track to match. Any insight would be greatly appreciated.
I had a try with the 1st method and got the results you got (not the same durations). It seems like it could be a bug to me (or at least not really working as should be expected). I also checked in "Project Settings" and set it to "start at 0" for frame count, and still didn't get the expected result.