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For device supports more than one stream, you can specify parameters for each stream type.

 

Main Stream

The stream stands for the best stream performance the device supports. It usually offers the best resolution and frame rate the device can do. But high resolution and frame rate usually means larger storage space and higher bandwidth requirements in transmission.

 

Sub Stream

The stream usually offers comparatively low resolution options, which consumes less bandwidth and storage space.

 

Other Streams

Steams other than the main stream and sub stream may also be offered for customized usage.