kVTCompressionPropertyKey_ConstantQualityFactor

Declaration

let kVTCompressionPropertyKey_ConstantQualityFactor: CFString

Discussion

Requires the encoder to maintain consistent quality by specifying a target constant quality factor in the range of 0.0 to 1.0.

In contrast to cases where kVTCompressionPropertyKey_Quality will cause the quantization parameter to adhere to a fixed value, this property is designed for consistent visual quality with or without bitrate limit constraints. 0.0 is the lowest quality and 1.0 implies the highest quality possible.