[HELP] Processes 20 minutes of video then white screen

[Selur]

How can I find out if the system CPU, GPU, RAM are overclocked?

if you did not overclock it, and you bought a pre-build system, it's probably not.
You could also use CPU-Z to check the clock speed of your cpu and memory and GPU-Z to check the gpu speed.

Perhaps there is something different in this version? (2022.07.19.1)

Mainly the dll versions changed, but if it was a general problem the whole clip would be white, not just starting at a specific position.
Also, if you encode the same clip is it always white starting at the same position?