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PNGIO library error--render failure
by
Eric Knisley on Oct 8, 2008 at 4:24:19 pm
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Greetings all,
I am rendering out frames of animation which will be played back in an immersive dome projection system. The frames are 2048x2048, 30 fps. I am rendering to .png files, no compression. I have used AE for many years, and have done this exact same task many times.
Now, for some reason, I am getting this error when I try to render:
After Effects: AEGP Plugin PNGIO Support: PNGIO library error: IDAT: CRC error (5027:: 12)
...at which point the rendering fails. The error is not consistent over the entire project (about six minutes); some sections will render just fine, and some will fail. Also, some fail instantly, while some will render 2-10 frames and then fail. Finally, some sections will report the error, but when the OK button on the failure box is clicked, the section renders anyway!
My best guess at this point is that the source files (.png files) contain some sort of error or corruption that AE doesn't like. However, I've used the very same files in the past with no issues. The one significant difference between this project and past ones is that this one is much longer, with many more layers of frame sequences and *a lot* more effects channels.
Has anybody had any experience with this error, and if so, can you offer any guidance? Thanks very much for any info,
Eric Knisley
Renaissance Computing Institute
UNC-Chapel Hill
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Re: PNGIO library error--render failure
by
Chris Wright on Oct 8, 2008 at 7:55:24 pm
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if you have render multiple frames simultanesouly on, PNG's fail, they are not thread safe. turn off multiproc or use TIFF or PSD instead.
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Re: PNGIO library error--render failure
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Gonçalo Perdigao on Nov 3, 2011 at 5:48:55 pm
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or instead, if you have quicktime pro, import the sequence and do a save as.
Problem solve
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Re: PNGIO library error--render failure
by
Carl Fontaine on Aug 22, 2012 at 3:10:11 pm
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We had the same problem on a project and we finaly found the solution. I'm posting this today because I was searching myself the solution and didn't found nothing on the web.
The problem is: we had a pre-rendered PNG sequence in our AE project, with some broken file (NOT MISSING). It's a 2000 frames background playing in loop. We found that some image was rendered (for unknow reason) like this...
You can see the strange lines at the bottom. It's very hard to see when you're looking at a big sequence in windows and no image is missing. The PNGIO error come up in AE only when you are on that image, in the project. That's how we found which exact frame was broken.
Also, we are rendering on a renderfarm. Maybe the PNG sequence had error because of this...
We re-rendered the broken PNG, restarted the render, and now it's fine!
I hope that help!
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Re: PNGIO library error--render failure
by
Rick Collins on Dec 10, 2012 at 9:29:04 pm
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I had the same problem. Turns out a few of my .png images were corrupt from a bad copy paste. Replaced the few bad .png's and now it works fine.
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