The full quality main stream is still recorded and available when you need it. Sub streams typically reduce CPU usage by 5x to 20x and make a struggling system run great.
Why use sub streams if they are lower quality? Sub streams are smaller (lower resolution and bit rate) and easier to process than main streams. What is a sub stream?Ī sub stream is a secondary video stream provided by your IP camera. Substantial improvements have been made since the feature was first introduced, so you should start with the latest version of Blue Iris.
As such, this can bring older systems, as well as non-intel CPUs into play as Quick Sync/Hardware Acceleration isn't a requirement now. Introductionīlue Iris is able to take advantage of sub streams to greatly reduce processing requirements starting with version 5.2.7 (May 1, 2020). The not-quite-comprehensive guide to using sub streams in Blue Iris.
