MacTel CS3 Problems.

[Darby Edelen]

[Todd Jaspers] “Doing a workflow that is 23.976 in After Effects kinda blows.”

Not to burst your bubble, but either your workflow all around is 23.976 or you have already blown it.

The composition presets in AE use the most commonly proper frame rates. If you change any to be different because you think they are wrong, then you are probably causing your footage (and yourself) unnecessary harm.

If you are using the proper 23.976 frame rate in your composition, then you shouldn’t need to change anything when you render. AE should automatically render at the composition’s frame rate (unless you’re adding a pulldown on render).

The difference between 23.976 and 23.98 (assuming that it is actually running at 23.98 instead of round up the 23.976 value) is 4 frames out of every 1000 seconds, so I’m hesitant to suggest that this is the sole reason you’re having trouble… But you can never rule anything out until the problem is solved.

Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA

[Todd Jaspers]

Hey lets end the 23.98/23.976 talk. I figured out the bug, and it is a bug. Has nothing to do with 23.98 and 23.976 at all.

here it its..
If I render proxy 1/2 res of a composition it doubles the top layers frames.
I figured it out by making a composition, add an adjustment layer and put a frame counter on that layer. Take that comp and render 1/2 proxy res. You will see the frame counter double its numbers while the animation in the bg still moves.

Its a bug, and Adobe blows.

-Todd

[Todd Jaspers]

Yes Darby, my bubble has burst. Its very warm and wet.

-Todd

[Todd Jaspers]

Yes Darby, my bubble has burst. Its very wet.

-Todd

[Pierre Jasmin]

THERE IS A BUG IN AE for ever WHICH I WILL TRY TO EXPLAIN HERE + workaround

If the footage comes from Avid, Premiere, FCP etc
I have seen this problem:

In Frame Rate select [x] conform to frame rate and type in exact values
23.976023976
and paste same value in
comp settings FPS
23.976023976
or 29.97002997002997 etc for that matter

These periodic fractions comes from the analog days where there was no floating point in hardware, so video engineers had to represent such things exactly using “rational” numbers (an integer over an integer)
29.97 comes from 30000/1001 (try it in your calculator)
60000/1001 is 59.94005994005994…
24000/1001 is 23.9760239760…

That looks like not much but it can be enough to make some fields “fall” on the wrong frame
Actually importing 59.94005994005994 as Premiere spits out in field project and setting a comp to FPS 59.94 in AE comp settings where you would drop such footgae will actually duplicate each field in AE (the second field will fall like at 0.4999 or something instead of 0.5 or over so will also be returned as the same field as 0.0)
Note sometimes AE abbreviates 29.970 to cue you it’s actually 29.97002997002997

Pierre

[Kevin Camp]

thanks for that explanation and workaround, pierre.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW

[Scott Robert]

I was having the same problem here with the 23.98 fps. In FCP, I would see duplicate frames rendered from AE. If I open the media in quicktime, there’s no dup frames. It only shows in FCP. Weird.

After reading this post, I set the comp fps to 23.976 and it worked for me. I have no duplicate frames. No bugs here.

THANKS GUYS!