QNAP Security VioStor CMS (Version: 1.0.1) - Manual (Page 136)

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The icons and description of the video playback page are shown as below:
Icon Description
Single channel playback view.
4-channel playback view.
9-channel playback view.
16-channel playback view.
Export video: Export a video clip by entering the time interval
of the playback.
Audio (optional): Enable or disable the audio function.
Digital zoom: Enable or disable the digital zoom function.
Zoom in/out:
Click these buttons to zoom in/zoom out a PTZ camera if that
camera supports digital zoom. With digital zoom enabled, the
buttons can be used to zoom in/zoom out the camera digitally.
Set the playback interval:
Set the time interval between the start and end points of a clip
for playback. This interval cannot exceed 24 hours.
Fit image to window/Keep aspect ratio:
Adjust the proportions of all or only the current video
depending on synchronous or asynchronous playback mode.
Asynchronous/synchronous playback mode in the multi-view
layout: Set the playback mode to be with the same playing time
or with independent playing time for each channel, but all in the
same interval.
Quick bookmark:
Bookmark an instant image of the camera.