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When creating a slideshow in Lightroom often some pictures are presented with block artifacts. This also applies to exported MP4-slideshows.
This happens to me in more or less everay slideshow.
It is independent from the camera I've used.
This makes the slideshow unusable for me.
MacBook Pro (16 inch, 2019); 2,3 GHz 8-Core Intel Core i9; RAM 32 GB 2667 MHz DDR4; Graphic AMD Radeon Pro 5500M 4 GB
Is there a solution?
Does it behave differently if /preferences/performance/use graphics processor/ is off?
It makes no difference if off, automatically or user defined. What I've recognized during the test: The fullscreen view of an image shows the same effect as when it is displayed during a slideshow.