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Digital hits, usually green blocks, on renders

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Bob Woodhead
Digital hits, usually green blocks, on renders
on Aug 5, 2019 at 11:01:28 pm

Infrequently I'll find digital hits in the shape of small rectangles, usually green, on rendered footage. They'll be in a section of timeline, always play back in the same spot, can pause on them, export out, and have gone away when I clear cached renders. I would assume bad sectors on my external SSD, but not sure of a method to analyze the drive. SMART status doesn't work on external USB, and Disk Utility doesn't help.

Suggestions?




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Dom Silverio
Re: Digital hits, usually green blocks, on renders
on Aug 7, 2019 at 3:23:41 pm

What kind of Mac and GPU are you using?


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Bob Woodhead
Re: Digital hits, usually green blocks, on renders
on Aug 7, 2019 at 3:30:00 pm

Late 2013 Mac Pro D700s


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Dom Silverio
Re: Digital hits, usually green blocks, on renders
on Aug 7, 2019 at 3:49:16 pm

Unfortunately, this is a design flaw on that Mac. During heavy CPU and GPU usage, the computer is unable to dissipate heat fast enough thus can cause random corruption. I highly recommend keeping renders in short bursts to prevent heat build-up.


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Bob Woodhead
Re: Digital hits, usually green blocks, on renders
on Aug 7, 2019 at 4:29:10 pm

Wow, I was sure it’d be a drive problem! I’ve got a utility that overrides the internal fan speed control, I wonder if there’s a utility to change the thresholds (the one I’ve got is just manual constant speeds).


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Bob Zelin
Re: Digital hits, usually green blocks, on renders
on Aug 7, 2019 at 5:27:40 pm

issue known for years -

https://macperformanceguide.com/blog/2015/20151212_1206-MacPro2013-BadVideo...

https://forums.adobe.com/thread/1686261


bob Zelin

Bob Zelin
Rescue 1, Inc.
bobzelin@icloud.com


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Bob Woodhead
Re: Digital hits, usually green blocks, on renders
on Aug 10, 2019 at 2:53:43 pm

Never ran across those articles, so thanks Bob.

For anyone reading this, there is a utility called Macs Fan Control, and there is an option to select any of the sensor points and adjust thresholds & fan speed. It was evident from sensor readings that on my MP '13 the GPU 2 sensor was much hotter than 1, so I just adjusted the threshold way down. If it's heat related, that'll fix that. :)


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Oliver Peters
Re: Digital hits, usually green blocks, on renders
on Aug 18, 2019 at 9:47:50 pm

I run into this constantly with Adobe apps (2013 MP, 8-core, D500). Usually when I have higher res media like 4K footage. I almost never have a problem with FCPX or Compressor. Resolve is so-so. Again more likely with higher res outputs. I also run Mac Fan Control cranked to max speed. It helps, but is not a cure.

- Oliver

Oliver Peters - oliverpeters.com


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