Jamie Coats wrote:...the Ultra will not render properly; it stutters the rendered video as if it rendered missing frames. When I take the exact same timeline and media because it is all on an external SSD drive, to my other Mac, it renders flawlessly. So it's an issue with the M1 Ultra; perhaps it's the encoders. Anyone have any thoughts on this?
Below was my reply to your post on the other thread. Two years ago I worked with FCP engineering on a frame order bug that happened on M1 Max and M1 Ultra. I think it also affected Resolve, although the investigation didn't cover that. It happened if certain temporal effects were rendered to cache, and this would sometimes persist to a ProRes output file.
What codec is your source material? What effects are on those? Does the problem persist if exported to a ProRes output file? If you can provide more information, I'll examine it.
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I have the M1 Ultra Mac Studio on Sonoma 14.6.1 and (like your case) Resolve Studio 19.01 works fine on that. I have not upgraded to Sequoia yet.
If you think it's the encoders, try View>Bypass Color & Fusion>Bypass All Grades and see if it exports slowly. That disables the GPU-intensive effects, which enables isolated examination of possible encoding perf. issues.
Also, there are separate encoders for ProRes vs H.264/H.265. As a test try exporting in ProRes 422 and see how that works.
When you say it "stutters", do you mean the exported file when played in Quicktime stutters? There was a similar problem a couple of years ago that affected both FCP and Resolve that was unique to M1 Max and M1 Ultra. If the exported video stutters on playback, use the JKL keys in Quicktime Player to go back and forth on that area to see if it is persistently the same frames.