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after effects lag/glitch problem

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tom drake
after effects lag/glitch problem
on Oct 24, 2010 at 10:08:02 am

When I render a game video, there is no problem at all, the video runs smooth. But when i render out a Skateboard video it starts glitching and will ruin the whole video. here is an example of the problem

It starts on the 2nd clip.
If there is anyone who has any suggestions, please leave a comment !


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Andy George
Re: after effects lag/glitch problem
on Oct 24, 2010 at 5:42:49 pm

You have not provided any information about your project or your computer so it's difficult to say. Ill take a wild stab at it though...

Im guessing your footage is one that uses interframe compression. Dave LaRonde explains more below.

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.

I'm a Mac guy, so I like to convert to Quicktime movies in the Animation or PNG codecs; both are lossless. I'll use Apple's Compressor, Adobe Media Encoder or Quicktime Pro to do it.

-Andy George
Senior Editor

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