Dear all,
finally I wrote experimental support for 10-bit HDMI output on Allwinner H6, so HDR videos should render without any processing, directly to TV. Note, due to missing HW decoding driver features, only VP9 is rendered in 10-bit, while HEVC is still rendered in 8-bit. However, due to proper settings in HDMI output, it should be better colourwise anyway.
Please test.
Source: https://github.com/jernejsk/LibreELEC.tv/commits/h6-10bit
Update file: http://jernej.libreelec.tv/test/h6-10bit/