QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 65)

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Playback Settings:
Play, pause, stop, reverse play a video file, or select to play the previous or next file.
When playing a video, use the scroll bar to adjust the playback speed or click the digital
zoom icon to zoom in or zoom out the video.
Right click the IP camera channel and select the following options:
a. Full screen
b. Keep aspect ratio
c. Deinterlace (available on particular camera models only)
d. Keep original size
e. Dewarp fisheye images: for Vivotek FE8171V/ FE8172
Right click the channel and enable the function. After that, you can select Mount type,
including wall, ceiling, and floor and then select Dewarping mode, including Panorama
(Full View), Panorama (Dual View), and Rectangle.
Remark 1: The camera firmware version should be v0100h or above. About the latest
camera firmware, please visit http://www.vivotek.com/index.php.
Remark 2: If the Mount type is Wall, only Panorama (Full View), and Rectangle are
supported in Dewarping mode.
Remark 3: If Dewarping mode is Rectangle, you can use PTZ control panel to operate
PTZ functions, excluding digital zoom.