Hardware acceleration comes in degrees... It's totally possible to hand-code some GPU firmware to decode any bitstream far more efficiently than the CPU can do it...
It's just a lot of work, and either Broadcom hasn't done it, or they don't want to license it to the Raspberry Pi.
I thought (for some reason, I could be wrong), that hardware acceleration for h265 implies actual dedicated silicon, either in the SoC itself or on the board?
It's just a lot of work, and either Broadcom hasn't done it, or they don't want to license it to the Raspberry Pi.