fields.
In Playback mode, it can be used to play or pause the video.
In Single-frame Playback mode, pressing the ENTER button will advance the
video by a single frame.
In Auto-switch mode, it can be used to stop /start auto switch.
Move the active selection in a menu. The inner ring will move the selection up and
down; the outer ring will move it left and right.
In Playback mode, the inner ring is used to jump 30s forward/backward in video
files. The outer ring can be used to speed up/slow down the video.
In Live View mode, it can be used to cycle through different channels.
In PTZ control mode, in can control the movement of the PTZ camera.