Davinci Resolve render problem with new Mac Pro

[Andi Winter]

hmm… did you try rendering without the max speed option?

if it is a heat-problem, try those slower renderings and report back!

andy

[Glenn Sakatch]

I had some bad rendering issues (only on one project), but I was constantly given screens similar to yours, as well as “dots” would appear on other rendered frames. When I say dots, I mean it kinda looked like a dead pixel, but it would only appear for a frame or two, and sometimes there would only be 1 or two dots…other times they would be all over the place.

Anyway, the only way I managed to get this thing comfortably rendered, where I thought I had it all correct was to set my render speed to 1 frame a second. This was a 2 min HD project, with plenty of nodes, but Resolve was ripping through it so fast, you couldn’t even see some of the issues until I did a playback of the renders.

By slowing it down, It forced resolve to load the frame, then render the frame.

At one point I slowed it to 5 fps, but it still glitched out at some points.

1 fps seemed to work for me. Wouldn’t want to do it for a 90 minute feature however.

Glenn

[Emiliano Mazzola]

Yes. i have setting 1 frame per second, but i have yet the same problem.

[Patrick Woodard]

All signs point to a bad driver/OpenCL bug. I have same issue. I would voice your concerns to Apple as I have. Hopefully a fix will come in the next OS update.

Patrick Woodard

Colorist
http://www.digitalfilmtree.com
http://www.patwoodard.com

[Marcus Herrick]

I get similar issues after a long render. I think it might be a heat issue. I have found a potential fix I think.

I have “iStat Menus” (https://bjango.com) on my system (so I can have lots of dials on the tool bar). I have found if I use manual fan speed settings to se the Mac Pro system fans to max (1900RPM) I don’t get the glitches. The fan speed difference between Apples standard and the Max fan is about 15 degrees on the GPU chips.

Running the fans on max stops the glitches on my renders.

Marcus Herrick
Freelance Editor / Grader

[Chris Coote]

I get glitches on renders sometimes when the new Mac pro has been on for a while. They look like long thin lines of green or pink, maybe 2 or 3 pixels tall and going across the whole frame. Restarting the machine makes them go away. Very annoying…

[Nat Jencks]

Chris I think you may be dealing with a different issue than others. I believe the thin green and pink lines are the result of a hardware issue, this was much discussed on the BMD forum and both myself and others were able to solve the problem completely by swapping out the machine.

I would suggest replacing the machine.

best-
-Nat

[Gino Amadori]

Hi Chriss, I was wondering if you were able to fix the problem you had with the annoying lines, I have been experiencing this problem ever since I got my Mac Pro and dispute all the updates and a change in graphic cards the issue doesn’t seem to go away.

Thanks for your help

Gino Amadori

[Chris Coote]

Hi Gino

We swapped out the machine a couple of weeks ago and so far I haven’t had any render problems.
I am also now on OS 10.10.5 and Resolve v12. When Apple tested the old machine, it failed a bunch of tests…

Chris