After Effects CS4 and 24pa footage

joshtownsend

Well-known member
The after effects help explains this but says it's for the dvx100 (no mention of my HVX200 or a Canon XL-2)

But what does the note at the end mean?


After Effects also supports Panasonic DVX100 24p DV camera pulldown, called 24P Advance (24Pa). Some cameras use this format to capture 23.976 progressive-scan imagery using standard DV tapes.

Before you remove 3:2 pulldown, separate the fields as either upper-field first or lower-field first. Once the fields are separated, After Effects can analyze the footage and determine the correct 3:2 pulldown phase and field order. If you already know the phase and field order, choose them from the Separate Fields and the Remove Pulldown menus in the Interpret Footage dialog box.

In the Project panel, select the footage item from which to remove 3:2 pulldown.
2. Choose File > Interpret Footage > Main.
3. In the Fields and Pulldown section, select Upper Field First or Lower Field First from the Separate Fields menu.
4. Do one of the following and click OK:
*If you know the phase of the 3:2 or 24Pa pulldown, choose it from the Remove Pulldown menu

.
*To have After Effects determine the correct settings, click Guess 3:2 Pulldown or Guess 24Pa Pulldown.



Note: If your footage file contains frames from different sources, the phase may not be consistent. If the phase is inconsistent, import the footage multiple times, once for each phase, and interpret each footage item with a different setting. Then, add each footage item to your composition and trim each layer to use only the appropriate frames.


http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-7f33a.html
http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-7f33a.html
 
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Sounds to me the note is meaning if you have multiple kinds of video formats recorded that were all captured as one stream. If you had 60i, 30p, and 24p in one video file, and you wanted to use them all, you have to import that file 3 times and interperate it in each format for that section of the file.
 
Some capture programs do not use scene detection. So even if you paused the cam, it would just record the whole.
 
The note makes perfect sense to me. It clearly pertains to a situation where the movie file you are importing consists of multiple shots edited together.

If you had 24p video or film material that you edited together in, say a 29.97 Avid or FCP project and then you exported that as a movie file and brought it into AE, there will be difficulties in AE interpreting all shots contained within the movie file correctly. This is because some of the shots may start on partial frames. Each specific shot in the cut will have its 3/2 cadence, but one shot may end on a C frame and the next shot may begin on the A frame. This results in the overall sequence having multiple cadences.
 
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