Found TOTALTRACKS in a FLAC file instead of TRACKTOTAL,
we should at least read this if present.
http://www.hydrogenaudio.org/forums/index.php?showtopic=91496&st=0&p=773857&#entry773857
{GST_TAG_TRACK_NUMBER, "TRACKNUMBER"},
{GST_TAG_ALBUM_VOLUME_NUMBER, "DISCNUMBER"},
{GST_TAG_TRACK_COUNT, "TRACKTOTAL"},
{GST_TAG_TRACK_NUMBER, "TRACKNUMBER"},
{GST_TAG_ALBUM_VOLUME_NUMBER, "DISCNUMBER"},
{GST_TAG_TRACK_COUNT, "TRACKTOTAL"},
+ {GST_TAG_TRACK_COUNT, "TOTALTRACKS"}, /* old / non-standard */
{GST_TAG_ALBUM_VOLUME_COUNT, "DISCTOTAL"},
{GST_TAG_ALBUM_VOLUME_COUNT, "DISCTOTAL"},
+ {GST_TAG_ALBUM_VOLUME_COUNT, "TOTALDISCS"}, /* old / non-standard */
{GST_TAG_ARTIST, "ARTIST"},
{GST_TAG_PERFORMER, "PERFORMER"},
{GST_TAG_COMPOSER, "COMPOSER"},
{GST_TAG_ARTIST, "ARTIST"},
{GST_TAG_PERFORMER, "PERFORMER"},
{GST_TAG_COMPOSER, "COMPOSER"},