Brief update, which has less to do with amlogic boards, but with hyperion: I've bought a Rasp Pi 3 B+ (the new 1.4GHz model) and, as expected, Hyperion is working flawslessly (with framegrabber of course).
Can it read HEVC? yes, very well now (tried movies with and over 12Mb/s, all OK)
Can it handle 4K? no, of course (but hyperion has problems with 4K anyway)
So, if you are still struggling with hyperion and dont care about 4K, this could be a cheap solution
Its still unnecessary cost Most of us, are owner of chosen amlogic box for some reason, buying additional box its not a solution. Cost of raspberry with additional staff you need for it (power supply, case, IR for remote etc.) is equal to external grabber on usb for 1080p content And you achieve not only ambilight for content played from the box, but also from other sources cause it grabs frames from hdmi signal
I hope the bug could be repair with proper kernel patch and im waiting for it