I installed Voukoder8 to my VMS16P and did few tests.
I loaded ~400 jpg's as slideshow (fades & pan) and render to 1080 25p.
No significant faster render with Voukoder, it took ~9 min on my system (~108%cpu and ~35%GPU)
But when I select VMS to render with it's NVE cuda it took just 2min! (~80%cpu and ~35%GPU)
* VMS crashed at ~50% of my tests at random points both in Voukoder and not.
** i5-6600,8G ram, gtx1050, 442 driver.