General Quicktime Metadata keys (from MacOS CoreMedia Framework headers and libs) VideoOrientation: like TIFF/EXIF Orientation property AffineTransform: used in place of a track display matrix, 3x3 float matrix in row major order Direction: degree offset from magnetic north .

QuickTime User Data as written by the "udta" handler using FourCC atom names.

defined to overwrite UnmarshalText, otherwise similar to xmp.AltString .