Resolution and bitrate are the two main factors affecting video quality. Differing video quality can be attributed to the different principles based on which bits are allocated to the video packets, called rate control modes. Rate control modes define how the encoding engine uses the buffer model and how bits flow into the engine.

The video quality in this study is represented in terms of VMAF (Video Multimethod Assessment Fusion); and higher the VMAF score, better the perceptual quality of the video.

In this part of the Myelin Whitepaper Series on Video Encoding; Rate Control Modes, you will learn about the difference between a constant and variable bitrate, and the impact of the different rate control modes on quality, along with observations and recommendations for use on different content / genre types.

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