Static kVTDecompressionPropertyKey_RealTime 

pub unsafe static kVTDecompressionPropertyKey_RealTime: &'static CFString

Available on crate feature VTDecompressionProperties only.

Hints the video decoder that decompression is, or is not, being performed in real time.

For non-realtime decompression, clients may set this property to kCFBooleanFalse, which indicates that it is OK to run this decode pipeline at a lower priority than is used for realtime decode. By default, the VideoToolbox will treat the VTDecompressionSession as though it is being used for realtime playback. Setting the property to NULL is equivalent to setting it to kCFBooleanTrue.

See also Apple’s documentation