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imported movs. drop frames over time.

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Robert Paynterimported movs. drop frames over time.
by on May 17, 2010 at 3:06:15 pm

I have a large file with many movs with a variety of codecs.
After working a bit in the file the movs start getting empty black frames. When I restart AE the problem is usually fixed. But after a while starts happening again. I'm having to restart AE 4-5 times a day.
It definitely happens when I import a new video (to any video not just the freshly imported one). But sometimes just happens on it own.

Anyone ever have this problem?

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Dave LaRondeRe: imported movs. drop frames over time.
by on May 17, 2010 at 3:28:53 pm

There is a set of common causes of AE Weirdness. Do any apply to you?

• Not having the free upgrade to AE 9.0.2 (if applicable).
• Trying to use multiprocessing with 6GB or less RAM: just turn it off.
• Trying to use Open GL to accelerate renders: it's typically good to turn it off.
• And the #1 cause of AE weirdness: the wrong kind of video footage! 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, 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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