Hi Habitual6824
thank you very much for the support you are giving me to make my port better.
Technically when using hardware decoding the cpu/gpu shouldn't be fully loaded so the temperature rise may be due to the ram clock.
I can certainly try to improve something, but keep in mind that to lower the price and save on components, the heat dissipation in these boxes is often non-existent. In some boxes there is not even a passive heat sink, and in others, it's too small.
For the 4k speech, maybe it's better if we try the same thing. So I ask you to try any of these videos
Samples - Official Kodi Wiki
both locally and via the network and share results. In this way, if you show me the problematic ones, I try to reproduce them in my box to understand what can be done ((if anything can be done).
I don't have a 4k TV so I usually see full HD content at most.
However, I will prepare a dtb similar to the legacy (which will become the default for the other boxes too)
Thanks again
Michele
edit: on mainline kernels, hardware decoding is implemented differently than on official rockchip kernels.
It's already a miracle that there is very good rockchip support for hardware decoding, and that's thanks to the immense effort of volunteers. This is to say that not everything that is supported by the legacy rockchip kernel, currently works on my port as well.