I just updated first post with new information and also uploaded brand new images.
This port is by any means not dead. I'm just not following forum every day, especially when working on features, in this case, completely reworking HW decoding paths and improving drivers.
New image has plenty of improvements, which might not be noticeable at first. However, there are few important ones:
1. H264 decoding should work very well
2. support for multi channel HDMI audio (correct audio output must be selected)
3. ditching vaapi and using native ffmpeg interface (much better memory handling)
4. improved H265 decoding
5. Analog audio output (3.5 mm jack) is supported on H3
6. A64 SoC support
7. HDMI CEC improvements, although this feature depends on board - it works on some and it doesn't work on others.