pub unsafe static AVMetadataQuickTimeMetadataKeyCameraLensIrisFNumber: Option<&'static AVMetadataKey>Available on crate feature
AVMetadataFormat only.Expand description
A value of type kCMMetadataBaseDataType_UTF8 indicating measure of the amount of light transmitted through the lens. It is the focal length divided by the effective lens aperture diameter (e.g. “F2.8” or “2.8”).
This is track-level metadata for video track that is associated with the camera.
See also Apple’s documentation