Sorry, I can't give an ETA.
Current priority is to get the hardware video decoders into shape (there are still some bugs to iron out), after that the HW decoder developer may have time to look into RPi3 HEVC decoding again. But that won't be an easy task, lots of things have to be changed so this can take some time.
so long,
Hias
I'm under the impression that RPi2/3 models are becoming too much of a hassle to be maintained.
Hope I am wrong. But what you said sounded a lot like backporting something too advanced to a dying model
Which will be sad. Because I haven't purchased a Rpi4 because my Rpi3 did playback 1080p HEVC 10bit (software decoding) using Librelec 9.
I will only buy another Rpi model when they release a version with AV1 hardware support.
I will revisit this thread in two months' time.
Thanks for replying to it.