The code inside dslibluray to control the mixer is literally a few lines. I am sure it could be swapped out with something else if needed. Someone could write some custom mixer that does the same that sits in between the filter and madVR. The 2nd pin needs to be able to render full frame rate over the main video. Overlays also still need to be able to render even when the main video pin is turned off. Bluray is a pain in the ass like that.
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