minSupportedExternalSyncFrameDuration
The minimum frame duration that can be passed as the videoFrameDuration when directing your device input to follow an external sync device.
Declaration
var minSupportedExternalSyncFrameDuration: CMTime { get }Discussion
Use this property as the minimum allowable frame duration to pass to AVCaptureDeviceInput/follow:externalSyncDevice:videoFrameDuration:delegate: when you want to follow an external sync device. This property returns kCMTimeInvalid when the device’s’ current configuration does not support external sync device following.