Oh seems with the last patches (maybe Rockchip: linux: add patch to fix RGB to YUV422 conversion in dw-hdmi · LibreELEC/LibreELEC.tv@8cce2e2 · GitHub) fixes the black screen on some emulators (especially Stella2014). Thats GREAT. Now i have ultimate entertainment platform even on my H3 orange pi pc.
Why is it beta? Nightly builds for H3 seems VERY stable. I have Pi0, Pi3 and i can compare.