#define GST_RIFF_INFO_IMED GST_MAKE_FOURCC ('I','M','E','D') /* medium */
#define GST_RIFF_INFO_INAM GST_MAKE_FOURCC ('I','N','A','M') /* name */
#define GST_RIFF_INFO_IPLT GST_MAKE_FOURCC ('I','P','L','T') /* palette setting */
-#define GST_RIFF_INFO_IPRD GST_MAKE_FOURCC ('I','P','R','D') /* product */
+#define GST_RIFF_INFO_IPRD GST_MAKE_FOURCC ('I','P','R','D') /* product (album) */
#define GST_RIFF_INFO_ISBJ GST_MAKE_FOURCC ('I','S','B','J') /* subject */
#define GST_RIFF_INFO_ISFT GST_MAKE_FOURCC ('I','S','F','T') /* software */
#define GST_RIFF_INFO_ISHP GST_MAKE_FOURCC ('I','S','H','P') /* sharpness */