kVTCompressionPropertyKey_SpatialAdaptiveQPLevel
A value that controls spatial adaptation of the quantization parameter (QP) based on per-frame statistics.
Declaration
let kVTCompressionPropertyKey_SpatialAdaptiveQPLevel: CFStringDiscussion
If set to kVTQPModulationLevel_Disable, spatial QP adaptation is not applied based on per-frame statistics. If set to kVTQPModulationLevel_Default, video encoder is allowed to apply spatial QP adaptation for each macro block (or coding unit) within a video frame. QP adaptation is based on spatial characteristics of a frame and the level of spatial QP adaptation is decided internally by the rate controller.