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AE rendering choppy footage?

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Jason Deyton
AE rendering choppy footage?
on Oct 15, 2009 at 8:42:17 pm


I'm having a problem with AE, seemingly only when a large number (~5) of pieces of footage are playing in the composition. With only one piece of footage, the comp runs smoothly. When scrubbing through the timeline, I can see the choppiness, as well as after I render it. Here is the final project, purposely in low quality:

. All of the footage has the same frame rate, and I've tried messing around with the resolution to no avail.

Any help is greatly appreciated.

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Dave LaRonde
Re: AE rendering choppy footage?
on Oct 15, 2009 at 9:14:31 pm

Sorry, I can't see the footage. But here are two most common things AE Rookies do wrong.
  • They use Open GL for rendering. Even the guys at Adobe don't use Open GL for rendering, which should be a clue.
  • They use HDV footage straight out of the camera. Read On:

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, mp4, 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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