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Mac Pro 7.1, Adobe Premiere 15.2, BMD DeckLink Minimonitor 4k Erratic video output

New Here ,
Jun 16, 2021 Jun 16, 2021

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Hi All,
Having a very strange problem which I hope someone can give me some idea on. When I boot up Premiere, HDMI video output from my DeckLink Minimonitor 4k card is fine for 5 minutes or so, then shows interference, (like this : https://photos.google.com/photo/AF1QipNmPlIQFAxmXI08aAy9MiZlW3n7z60xxA2K56tk ) then goes blank-ish (like this https://photos.google.com/photo/AF1QipO-3-vyInc24WuC-2nOIrW2GU_Dvxkm68OLvBD_).
And here's the kicker, restart the machine and everything fine for 5 minutes ago and it starts all over again.
Done all the normal stuff: deleted caches and preferences, uninstalled and reinstalled both Premiere and the Blackmagic drivers. Video is garden variety 1080i proves from a BMD disk recorder and has never caused any issues.

Any ideas ? Really need this to be over....

System config:
Mac Pro 7.1
12 core 3.3 Ghz
48 GB ram
Radeon W5700 X, 16 GB
Catalina 10.15.7
DeckLink Minimonitor 4k
Desktop video 12.1
Adobe Premiere 15.2

TOPICS
Error or problem , Hardware or GPU

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