Thanks what's nightly build?First off you can use OBS to record your games in quicksync right away.
For conversion I use Handbrake you probably will have to download a nightly build.
Quality will depend on the settings,bitrate is most important but also always use high profile and at least the balanced encoder profile.
The sad thing is that if your cpu supports quicksync it probably already has the necessary horsepower to do a quality encode at a respectable bitrate. Which renders quicksync obsolete.
Is CRAP - Learn how to use TMPGEnc Video Mastering Works-5.0.6.38 or MeGUI Developer.movavi video converter