This white paper examines three key bitrate control methods used in video surveillance: average bitrate (ABR), variable bitrate (VBR), and maximum bitrate (MBR). It explains how bitrate control balances video quality with storage and bandwidth limitations. ABR dynamically adjusts video quality over time to meet storage targets, VBR delivers the highest quality but with unpredictable storage usage, and MBR enforces strict bitrate limits at the cost of potential quality loss. The paper highlights how scene complexity, motion, and compression settings influence bitrate behavior. It concludes that combining ABR with an MBR limit often provides the best balance between quality, efficiency, and system reliability.

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