Don't no what the cause is but MT freezes after about 2 minutes decoding H265 1M/S older versions as well do the same.
It seems to lose contact with the LAV codec as just before it freezes I get an extra LAV decoder Icon on the task bar.
Win 10 1909 Dual 6 core Xeon with two Nvidia K4000 GPU
Any ideas?
Mike G8LES