Static kVTCompressionPropertyKey_MaximizePowerEfficiency 

pub unsafe static kVTCompressionPropertyKey_MaximizePowerEfficiency: &'static CFString

Available on crate feature VTCompressionProperties only.

Hints to the video encoder that it should maximize power efficiency during encode.

For compression where the client is operating in the background, clients may set this property to kCFBooleanTrue, which indicates that the encoder can take steps to minimize impact on power usage and other system activity. Setting the property to NULL is equivalent to setting it to kCFBooleanFalse. Not all video encoders support this property. By default, this property is NULL. If the kVTCompressionPropertyKey_RealTime property is set to kCFBooleanTrue, the video encoder may act as though this property were set to kCFBooleanFalse.

See also Apple’s documentation