ADOBE AFTER EFFECTS: Forum Expressions Tutorials Creative Cloud

Render automatically converts 23.976 to 29.97

COW Forums : Adobe After Effects

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
Todd SandlerRender automatically converts 23.976 to 29.97
by on Aug 24, 2011 at 5:00:46 pm

Hi There-

I am working in a 23.976 project with DV/DVCPRO 23.976 material that originated in MPEG Streamclip (DVD extracting). When I go to render out using the DV/24p setting, it automatically converts it to 29.97.

Filed Order is set to lower, 3:2 Pulldown is off, I tell it to use 23.976 as the frame rate, and to no avail, it keeps rendering out at 29.97. Of course I can use a different codec, but I would really like to understand why I can't render this out at 23.976 frames.

Any info would be greatly appreciated.

Todd

Todd

MC 5.0.3
FCP 7.0.3
AE CS5
OS 10.6.8
2 X 3.2 QuadCore
26GB RAM
QT 7.6.6


Return to posts index

Kevin CampRe: Render automatically converts 23.976 to 29.97
by on Aug 24, 2011 at 5:25:51 pm

i believe that dv and dvcpro (and other dv variants) need, or should, conform to ntsc standards... so 29.97fps. probably due to being a tape-based format.

as far as going to another codec/format, there may be better options depending on you destination (ie, tape, dvd, web, broadcast tv, etc...)

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


Return to posts index

Todd SandlerRe: Render automatically converts 23.976 to 29.97
by on Aug 24, 2011 at 5:29:32 pm

Thanks for you quick response. I understand what you say above, but still don't understand why, if the footage is interpreted as 23.98, and it is recognized in QT as 23.98, won't after effects render it out as such? I forgot to mention that I am bringing this footage back into a FCP timeline set at 23.98 NTSC/DV.

Todd

MC 5.0.3
FCP 7.0.3
AE CS5
OS 10.6.8
2 X 3.2 QuadCore
26GB RAM
QT 7.6.6


Return to posts index


Dave LaRondeRe: Render automatically converts 23.976 to 29.97
by on Aug 24, 2011 at 7:39:27 pm

Did you rip a 29.97 DVD or a 23.976 DVD? They can have either frame rate.

It it was indeed a 23.976 DVD, did you double-check the frame rate at which you created the file?

What codec did you use when you created the file using MPEG Streamclip? Since you run FCP, I would have used ProRes 422 or PNG in your case.

If you import the footage into FCP, what frame rate do you see in the browser?

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


Return to posts index

Todd SandlerRe: Render automatically converts 23.976 to 29.97
by on Aug 25, 2011 at 1:48:17 am

Hi Dave. To answer your questions,

1. I ripped a 23.98 DVD
2. The frame rate of the footage according to QT Movie Inspector, AE and the FCP browser is 23.98.
3. I used the DV/DVCPRO-NTSC codec. I have had issues in the past when exporting to Pro Res from MPEG Streamclip with FCP. Clips not playing back in RT, green vertical line running down the side of the frame, overall image color gets degraded when playing back from timeline, etc. (probably another forum discussion for that one). That is why I have stuck with the DV/DVCPRO codec for DVD extracting.

Let me know if you have any thoughts.

Thanks

Todd

MC 5.0.3
FCP 7.0.3
AE CS5
OS 10.6.8
2 X 3.2 QuadCore
26GB RAM
QT 7.6.6


Return to posts index

Walter SoykaRe: Render automatically converts 23.976 to 29.97
by on Aug 25, 2011 at 1:40:07 pm

[Kevin Camp] "i believe that dv and dvcpro (and other dv variants) need, or should, conform to ntsc standards... so 29.97fps. probably due to being a tape-based format."

This is exactly it.

Pre-CS5, After Effects was less than rigorous about output module constraints. With CS5 and later, AE sticks to the specs. See http://forums.adobe.com/thread/706576?decorator=print&displayFullThread=tru... for more.

That aside, I'd try to sort out your ProRes issues. It's a much better codec. Two generations of DV re-encoding on top of MPEG-2 from DVD is throwing away a lot of quality.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]