When live viewing or playing back on DMSS, you have the option to switch between substream and mainstream footage.
Substream is lower quality footage, usually used when viewing multiple cameras at once from a mobile device.
Mainstream is high quality footage, but its requires more bandwidth then substream.
There are two ways to change this setting, by device which changes the default stream type for the device, or by switching the individual camera stream when you are live viewing.
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