pub unsafe static kVTCompressionPropertyKey_MaximumRealTimeFrameRate: &'static CFStringVTCompressionProperties only.Expand description
Indicates the maximum real time rate at which frames could be submitted to the VTCompressionSession
The frame rate is measured in frames per second. This property can be used to inform the encoder of the maximum rate that frames could be submitted to the encoder during realtime encoding. This allows the encoder to configure itself to ensure this capability. This property can only be used when kVTCompressionPropertyKey_RealTime has been set to true. Unlike kVTCompressionPropertyKey_ExpectedFrameRate, this property informs the maximum possible rate that the VTCompressionSession could see, not the average frame rate that is expected in normal operation. By default, the property has a value of zero indicating “unknown”.
See also Apple’s documentation