There are problems when capturing games with VSync enabled. It results on low framerate, freezes and stuttering. When removing VSync, game capture is OK.
Vsync enabled
2018.04.07-13.52.mp4 - Google Drive
Vsync disabled, 45 fps cap
2018.04.07-13.46_01.mp4 - Google Drive
One solution you may come up with is disabling Vsync and setting a fps cap (30, 45, 60). Yes, that works. But not for all games. In The Witcher 3, you have to enable VSync to avoid tearing (or have a FreeSync monitor). In-game cap or Radeon Relive FRTC don't prevent tearing. Actually, 60 fps game capture for TW3 isn't possible at this moment due to this Radeon Relive bug.
I already did a clean installation. The issue persists.
RX 480
Adrenalin 18.3.4
Windows 10 Pro 1709