Static kVTCompressionPropertyKey_OutputBitDepth 

pub unsafe static kVTCompressionPropertyKey_OutputBitDepth: &'static CFString

Available on crate feature VTCompressionProperties only.

When set, requires the encoder to output bitstream with the requested bit depth, if supported by the configured profile level setting. In the absence of this property, the video encoder will assume the highest bit depth allowable by the configured profile level setting.

See also Apple’s documentation