The Outputs screen displays all the outputs that have been created. If you have configured multiple sources for the same output stream, the sources are displayed in the Primary sources, and Fallback Sources panes below. The primary sources can be multiple sources that are defined for availability purposes (if a certain primary source is faulty, the other primary source will be used). Additionally, a fallback source can be defined. If the primary sources are not available, the fallback source will be used until one of the primary sources becomes available.
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