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Black Frames in Stop-Motion/Video Footage Compilation

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Tyler AltermanBlack Frames in Stop-Motion/Video Footage Compilation
by on Mar 31, 2010 at 2:26:16 am

I've been having problems with this stop motion vid I've been assembling through AfterEffects. To composite the clip, I recorded footage of Central Park, and then overlaid a stop-motion sequence of transparent .pngs. In the resultant vid, there are these random black frames showing up everywhere. The black frames are present in neither the stop-motion sequence or the footage when rendered and played separately. Any idea what's up? Here's the vid:


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Dave LaRondeRe: Black Frames in Stop-Motion/Video Footage Compilation
by on Mar 31, 2010 at 1:17:49 pm

Dave's Stock Answer #1:

If the footage you imported into AE is any kind of the following -- footage in an HDV acquisition codec, MPEG1, MPEG2, AVCHD, mp4, mts, m2t, H.261 or H.264 -- you need to convert it to a different codec.

These kinds of footage use temporal, or interframe compression. They have keyframes at regular intervals, containing complete frame information. However, the frames in between do NOT have complete information. Interframe codecs toss out duplicated information.

In order to maintain peak rendering efficiency, AE needs complete information for each and every frame. But because these kinds of footage contain only partial information, AE freaks out, resulting in a wide variety of problems.

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

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