I am so confused! I have a 95 minute uncompressed avi file exported from premiere pro, 23.98 frame rate
I imported it into after effects cs3 to do a simple color correction on the entire file (because it wasn't working in premiere for some reason). But when I export it it looks different, like some frames are blurry, like they are a blend of two different frames. But motion blur is turned off as is frame blending. I made sure the imported file is interpreted as 23.98 with no pull down and no fields. And when I scrub through it frame by frame in after effects before rendering it out it looks fine.
In a separate file I did that was shorter (about a 20 minute file, same settings as above) it not only blended the frames, but it got "off". In other words, when I placed the rendered out file on top of the old file to make sure it lines up, it lines up near the beginning, but then gets off. I'm not sure if it did this on the 95 minute file as well because I deleted it before I knew to check. :-/
What on earth is happening??? Again, I checked and it is interpreted correctly, 23.98, no pull down.
Re: why is it blending frames??? by Kevin Camp on Oct 3, 2008 at 6:33:29 pm
if it is true 24p, the frame rate should be 23.976 fps in ae. make sure the footage is interpreted that way and that the comp is at that setting too.
the other thing you need to be sure of, is that premiere did not do anything to the footage at export, like add a pulldown or change the frame size (like scale the footage from 720x480 to 720x486)... if it did add a pulldown and scale the vertical frame size, you will get field mush on some frames and that will look like frame blending on those frames...
Re: why is it blending frames??? by jonathan grant on Oct 4, 2008 at 1:30:44 am
It's at 23.98 and it didn't add a pull-down (I exported it microsoft avi with "none" compression), in after effects there are no repeat frames so I know it's the right frame rate. It's on the right frame rate setting in after effects, 23.98 with no pull-down.
And I don't believe it scaled it any differently than 720x480 (it's the default export setting in premiere cs3, so that should be correct right?)
Re: why is it blending frames??? by Dave LaRonde on Oct 4, 2008 at 2:32:57 pm
[jonathan grant]"It's on the right frame rate setting in after effects, 23.98 with no pull-down. "
Well, now, that's just the point. There is NO SUCH FRAME RATE as 23.98. It's 23.976. If AE's reading the frame rate as 23.98, it's because you made a mistake when you exported from your NLE.
Go back and correct it, do your work at 23.976 in AE -- because Adobe is one of the few companies that calls a spade a spade when it comes to the NTSC film frame rate -- and life will be good again.
Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
Re: why is it blending frames??? by jonathan grant on Oct 4, 2008 at 3:22:16 pm
Thanks, I'll look into it but I just used shorthand. I'm assuming that it knows what the frame rate of the footage is. I'll check it out though, thanks for the heads up! :)
Re: why is it blending frames??? by Dave LaRonde on Oct 5, 2008 at 6:51:21 pm
Okay, now we're down to one more variable: how you captured the footage.
If you captured the footage at 29.97, you've probably got pulldown in it. I THINK -- I don't know for a fact -- that if you put 29.97 footage containing 3:2 pulldown into an Avid 23.976 edit timeline, it'll look just fine.
Does this necessarily mean that when it exports the footage from the timeline, the pulldown will have been removed? I don't know. You'd have to check your Avid manual on the proper procedures for working with 24p footage. I work in Final Cut pro, and you most certainly have to remove the pulldown from 24p footage before you edit in a 23.976 timeline.
If I was a bettin' man, I'd bet that the problem is that the pulldown wasn't removed.
Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
Re: why is it blending frames??? by jonathan grant on Oct 5, 2008 at 10:06:20 pm
Okay, fixed the problem. The issue WAS the difference between 23.98 and 23.976, but it wasn't the footage that was 23.98 but the COMP that was 23.98! I didn't think to check the comp! (or rather I thought I was, but I was just checking the footage)
