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Corrupt renders – possible answers
I’ve posted a few times in other threads about having render issues, where a single frame has been corrupted when rendering the timeline or when exporting an unrendered timeline. This started for me with FCP X 10.0.6 and continues with 10.0.7. I think I have boiled down what is causing it and a workaround.
I work a lot with log profile camera footage from Alexa, C300 and F3 cameras. I typically apply a filter to the footage as a LUT to correct the flat gamma profile back to Rec 709. The issue appears to occur when I am using either the Pomfort Alexa Look2Video or the IRUDIS Tonalizer filter. The corruption occurs when rendering to a 10-bit codec (any ProRes format or 10-bit uncompressed). The corruption is random, but becomes more consistent as you add processes (more filters, transforms, keying, color board, etc.).
If you are experiencing similar issues, the workaround seems to be either not to use these plug-ins or to render to 8-bit uncompressed. So far, I have tested both of these options with success.
– Oliver
Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com -
5 Replies
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[Oliver Peters] ” you are experiencing similar issues, the workaround seems to be either not to use these plug-ins or to render to 8-bit uncompressed. So far, I have tested both of these options with success.
“Oliver, I’ve been having the odd problems to when doing similar intensive procession (Multicam, Keying, color etc). I’ve had some weird one’s like a frame flipping upside down for no reason.
Haven’t been using the filters except SliceX.
I was wondering if it was the speed of my system but I guess not.
Michael Sanders
London Based DP/Editor -
[Michael Sanders] “Oliver, I’ve been having the odd problems to when doing similar intensive procession (Multicam, Keying, color etc). I’ve had some weird one’s like a frame flipping upside down for no reason.
Haven’t been using the filters except SliceX.”That’s the sort of corruption I saw. Also flashing frames. I recently had to remove SliceX because it was preventing the angle viewer from displaying images.
My general attitude about plug-ins is that many developers try to tweak the spec under-the-hood. These are likely to break with new updates, especially as Apple is making changes to AV Foundations. Typically you are safe when the plug-in is a Motion template that the developer has created in Motion and published as an FCP X effect. That’s the case with the various freebees, as well as many of the low-cost paid filters. I’ve also had very good luck with anything installed through FxFactory.
Everything else is suspect as far as I’m concerned. Doesn’t mean it won’t work fine. It’s just that X is still evolving and somewhat of a moving target. Some developers have trouble staying on top of these changes. You definitely have to check for updates for any of the big plug-in packages with each and every FCP X update.
See if rendering to 8-bit uncompressed works as a solution for you.
– Oliver
Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com -
I get corrupt frames in FCP7 from Pomfort a lot. Sometimes simply toggling the filter on and off would clear it, sometimes I’d have delete and re-add a fresh instance of the filter.
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I read a thread on red giant where they claimed”send to compressor” would fix the problem. Unfortunately any sequence I send to compressor causes it to hang and crash as soon as I apply a setting. Anyone else have this problem?
I get the corrupt renders from dslr footage which is 8 bit. Does fcp automatically render to ten bit? And where can I change the preference to 8 bit?
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[David Powell] “I read a thread on red giant where they claimed”send to compressor” would fix the problem.”
Yes, I tested Send to Compressor. Renders were also clean, but the export/render was significantly slower than through the Share menu.
[David Powell] ” Does fcp automatically render to ten bit? “
I don’t know. ProRes is supposed to shift between 8 and 10-bit dependent on the original source. My guess is that FCP X renders to ProRes are always 10-bit and there is no way to change that.
– Oliver
Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com
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