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I have some H.265 10-bit 4K 50p footage from my Sony A7SIII, and I created proxies to enable smooth editing.
When I play the clips in the source monitor they play perfectly smoothly but when I put them onto a sequence they stutter a bit on the program monitor. Rendering the timeline makes no difference.
I have tried various sequence settings, EG. 1080p, 4K, match clip etc and I have toggled the proxy button which appears to make no difference in the program monitor.
I have tried both h.264 and quicktime proxies but again, no difference.
Laptop is i9 processor, 32GB memory, Nvidia RTX 2080, and editing off SSDs.
Premiere pro 15.4 build 47.
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The issue is finally solved. Nothing to do with Premiere. There is a problem with the driver on the screen I was using for the program monitor.
Thank you @Ann Bens for your suggestions.
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I have a bit more info on this. The problem above ocurrs when I have the the program monitor on a different screen. If I use a single monitor arrangement it all seems to work just fine. And if I toggle proxies off it still displays smoothly without rendering the timeline. I can't explain it.
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So to verify this behaviour I have restarted Premiere and tested with a single monitor layout which works fine and with a two monitor layout which stutters on playback.
I'm using the latest Nvidia Studio Driver.
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There is no point in H.264 for proxies: still stuck with the long gop issue.
Try Prores Low Res proxies and make sure the preview codec in the sequenc setting is set to Prores too.
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Best is to have the program monitor on the main screen.
As for the Nvidia driver make sure it is the studio driver and not the game driver.
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I've been working with a two monitor set up for years with no issue. I keep the program monitor on it's own screen because I want a large image. It's never been a problem before.
I am using the Studio driver, and I have tested all kinds of proxies, which make no difference.
I am a heavy user of Premiere as I run a video business. Something has changed in either Premiere or the Nvidia Studio driver that makes the difference.
Well, at least I have a workaround as I can revert to a single monitor layout.
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Yep, tried Low Res Prores proxies, but doesn't affect the behaviour I described above. All the flavours of proxies work just fine when on a single monitor layout, but none of them work properly on a dual monitor setup.
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The issue is finally solved. Nothing to do with Premiere. There is a problem with the driver on the screen I was using for the program monitor.
Thank you @Ann Bens for your suggestions.

