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You can select the defaut video stream (see The Camera object) for all video cameras on the layout on the top panel:

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When you switch to the layout editing mode, buttons for selecting the quality of the video stream will be displayed on the top panel. The number of cameras with the selected video stream quality is displayed above each button.

When you click the buttons, all multi-stream video cameras switch to the selected video stream quality, except the Other quality (see Selecting video stream quality in a Surveillance window (GreenStream)).

Also in the editing mode, the selected quality of the video stream is displayed in the upper right corner of the video surveillance window.

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