Check the specifications of the USB cable that you’re using when connecting the VR-120HD to your computer.
If you are using a USB cable that doesn’t conform to USB 3.0 specs or later, the video output resolution is changed to SD (640 × 480). To output video for streaming to your computer in HD (1920 × 1080), be sure to use a cable that meets the USB 3.0 specs (or later).
You can check the specifications for the connected USB cable in “Output Status”.
[MENU] button -> “Video Output” -> “USB Out” -> “Output Status”