pub unsafe static kVTCompressionPropertyKey_SpatialAdaptiveQPLevel: &'static CFStringAvailable on crate feature
VTCompressionProperties only.Expand description
Control spatial adaptation of the quantization parameter (QP) based on per-frame statistics. If set to kVTAdaptiveQPLevel_Disable, spatial QP adaptation is not applied based on per-frame statistics. If set to kVTAdaptiveQPLevel_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.
See also Apple’s documentation