mov: read album_artist atom

Signed-off-by: NAnton Khirnov <anton@khirnov.net>

libavformat/mov.c

@@ -151,6 +151,7 @@ static int mov_read_udta_string(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     case MKTAG(0xa9,'n','a','m'): key = "title";     break;
     case MKTAG(0xa9,'a','u','t'):
     case MKTAG(0xa9,'A','R','T'): key = "artist";    break;
+    case MKTAG( 'a','A','R','T'): key = "album_artist";    break;
     case MKTAG(0xa9,'w','r','t'): key = "composer";  break;
     case MKTAG( 'c','p','r','t'):
     case MKTAG(0xa9,'c','p','y'): key = "copyright"; break;