Constant quality video coding

A system for providing video coding on a computing device, comprising:

• a memory configured to store video data;
• and
• a graphics processing unit coupled to the memory, wherein the graphics processing unit comprises:
• quantization parameter circuitry configured to:
• determine a first quantization parameter for a video frame of a video sequence;
• modify the first quantization parameter based on at least one of a spatial complexity or a temporal complexity associated with the video frame to generate a second quantization parameter for the video frame;
• and
• generate a block level quantization parameter for an individual block of the video frame based on the second quantization parameter, a complexity of the individual block, and a complexity of the video frame;
• and
• quantization circuitry configured to:
• quantizing transform coefficients associated with the individual block based on the block level quantization parameter to generate quantized transform coefficients.

At least one machine readable medium comprising a plurality of instructions that in response to being executed on a computing device, cause the computing device to perform video coding by:

• determining a first quantization parameter for a video frame of a video sequence;
• modifying the first quantization parameter based on at least one of a spatial complexity or a temporal complexity associated with the video frame to generate a second quantization parameter for the video frame;
• and
• generating a block level quantization parameter for an individual block of the video frame based on the second quantization parameter, a complexity of the individual block, and a complexity of the video frame.