library and program to read and write meta information in multimedia files

 ExifTool is a Perl module with an included command-line application for
 reading and writing meta information in a wide variety of files, including
 the maker note information of many digital cameras by various manufacturers
 such as Canon, Casio, FLIR, FujiFilm, GE, HP, JVC/Victor, Kodak, Leaf,
 Minolta/Konica-Minolta, Nikon, Olympus/Epson, Panasonic/Leica, Pentax/Asahi,
 Phase One, Reconyx, Ricoh, Samsung, Sanyo, Sigma/Foveon and Sony.