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when AE finishes rendering, video turns black

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Jakob Schlötterwhen AE finishes rendering, video turns black
by on Dec 28, 2010 at 6:46:04 pm

Hello,

I have a weird problem with rendering.

- firstly i rendered the video in h.264.
- the preview in after effects looked perfectly
- i stopped rendering, and watched the rendered file in quicktime. looked perfect.
- i continued rendering until after effects finished rendering.
- i opened the file with vlc & quicktime. it was completely black, audio worked normaly.
- here are my settings:


- then i tried the same with quicktime/jpeg-format, with the equal outcomst:



here the properties of my used footage (it's shot with a D90 and directly from camera):



I reviewed my render-history and i saw that the files were only viewable, when i aborted rendering!!!
weird!
I could abort shortly before the movie finishes, but that's a really stupid solution.

what is happening here?
when i searched the forum, i didn't find a proper solution.

any ideas?

greetings,
jakob


ps: sorry for the german images, but i think translating is not necessary


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Amit ZinmanRe: when AE finishes rendering, video turns black
by on Dec 28, 2010 at 9:26:23 pm

Did you try updating your quicktime version and maybe a nice restart?



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Jakob SchlötterRe: when AE finishes rendering, video turns black
by on Dec 29, 2010 at 9:14:29 am

well, i have the newest quicktime version installed (7.6.4) and i restarted several times.

now i try to render the movie piece for piece uncompressed, and it seems working.
though it's not really a nice solution, because i'm running slowly out of discspace ;)


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Dave LaRondeRe: when AE finishes rendering, video turns black
by on Dec 29, 2010 at 5:36:45 pm

If you don't have the latest version of After Effects -- for example, you have AE 9 -- and you are using footage from an HDV camera, you need to know this, too:

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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Jakob SchlötterRe: when AE finishes rendering, video turns black
by on Dec 29, 2010 at 8:40:38 pm

I read your stock answer already.
i hoped that i can avoid this.
also it's weird, because if i avoid rendering, the file is okay.
Also, the problem only occurs when i render a composition containing other compositions (I found that out just right now).

I will try converting the footage, though it doesn't really make sense to me.
If it works, I will be confused but happy anyway. Yes, okay, i will try it. Allright.


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Dave LaRondeRe: when AE finishes rendering, video turns black
by on Dec 29, 2010 at 8:50:13 pm

"i hoped that i can avoid this."

If you don't have AE CS5, you almost never can avoid it.

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


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Jakob SchlötterRe: when AE finishes rendering, video turns black
by on Dec 29, 2010 at 8:55:49 pm

haha, okay, so... seems like i need an update... thanks for your patience!


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Amit ZinmanRe: when AE finishes rendering, video turns black
by on Dec 29, 2010 at 9:33:00 pm

Try rendering to qt jpeg or simply to mpeg-2 (which newer versions of Adobe really like, FCP, less so)



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