QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 70)

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Video Resolution: Specify to adjust resolution automatically or use fixed resolution. If
you select to adjust resolution automatically, the NVR will select the resolution setting*
which best fits the size of the IE browser window. Note that ‘Stream from network camera’
will not be available if the network camera does not support streaming from camera or
video resolution configuration. Both options will not be available if the network camera
does not support multiple streams.
*If a network camera supports different resolution settings, the NVR will select the smallest
resolution larger than (or equal to) the size of the browser window.
If all the supported resolution settings of a network camera are smaller than the browser
window, the largest resolution will be selected.
Let me choose other cameras to apply the same settings:
Select this option to apply
the changes to other network cameras. Note that some settings may not be applied if the
network camera does not support the features, such as streaming from camera or video
resolution configuration.