Optiview HDVR4/8/16-Q2 User Manual page 189

In main menu, from Setting->Camera->Encode->Snapshot interface, here you can
input snapshot mode as regular, size, quality and frequency. See Figure 4-155.
In main menu, from Setting->Camera->Encode->Schedule interface, please enable
snapshot function. See interface on the right of Figure 4-156.
Please refer to the following figure for detailed information.
Figure 4-154
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