I recently upgraded to Windows 11, just in case that matters, and I went to encode a series of images into a video with FFmpeg like I usually would. For some reason seemingly randomly it just stops. No error is given, the frame that it stops on is random, the amount of time it's encoding for is random, and starting from a different frame doesn't change anything.
Here is the code I'm using:
ffmpeg -r 59.94 -f image2 -start_number 0 -i "%06d.png" -vcodec libx265 -crf 18 -preset medium -tune grain -pix_fmt yuv420p10le "Encode/S2005E14.mp4"
The CPU being used to encode it is a Ryzen 3900x.
I don't know which version of FFMPEG that site you linked is using.
Here is the website for the developer of FFMPEG. It shows several coding and shows you where you can download the latest version with patches: https://www.ffmpeg.org/developer.html
You can try and contact them and show them your coding to see if that is the reason for your issues or the version you have installed.
Also when you are rendering what is your processor's temperature?
Are you using a AMD ProRender plug in by any chance?
EDIT: The above link shows the FFMPEG Forum which would be the best place to post your question and coding: https://superuser.com/questions/tagged/ffmpeg