Finally with Vegas pro 18 editing h.265 videos is working using a Nvida GTX 1070 and Ryzen 1800X 8 core CPU.
Until Vegas 17 editing, preview, timeline was soooo slow - impossible to enjoy working.
But I have a last question / issue:
My windows 10 system is freshly installed but I only get intel QSV and NV encoder as an option when choosing to render in magix hevc 4k. also when looking into the render template customization .. its just the same.
What should be there as CPU render option when creating HEVC videos using a Ryzen CPU?
When using Intel QSV first time a pop up message appeared, that Mainconcept codec was loaded. Rendering speed in 4k is around 1 frame a second :-(
So a 1.5 minute clip takes 40 minutes to render.
thanks a lot.