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Video Duration Problem

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Alex KittavongVideo Duration Problem
by on Aug 20, 2010 at 2:39:51 pm

I have a MP4 file that is 1 hour long. When i import it into after effects, it says its 16 minutes long. I don't know what the problem is there. Can anyone help me out?

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Karl-Jason MawdsleyRe: Video Duration Problem
by on Aug 20, 2010 at 3:53:19 pm

I don't think AE handles MP4 (H.264?) all that well. You're probably better converting it to a more acceptable compression and then importing it. MPEG Streamclip is free and awesome!

KJ Mawdsley
Editor/Mograph Designer

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Dave LaRondeRe: Video Duration Problem
by on Aug 20, 2010 at 4:17:09 pm

If you're not using AE 10 (aka CS5), you'll have to convert that footage as mentioned above. Here's why:

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.

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

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