I noticed the same issue on both simulator and device.
tejanvm
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It seems my extension target CONFIG_BUILD_DIR is set to build, and when I change it to $(BUILD_DIR)/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME), I'm able to build successfully.
I used brightcove player, and I confirm I have these black screen issues. The brightcove logs seem to be fine and we suspect it might be an issue with AVPlayer itself. Looking forward for an update on this issue.