QNAP Security VioStor NVR (Version: 3.5.1) - Manual (Page 60)

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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