use MKTAG

Originally committed as revision 8513 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/isom.c

@@ -150,7 +150,7 @@ const AVCodecTag codec_movaudio_tags[] = {
 
     { CODEC_ID_MP3, MKTAG('.', 'm', 'p', '3') }, /* MPEG layer 3 */ /* sample files at http://www.3ivx.com/showcase.html use this tag */
     { CODEC_ID_MP2, 0x6D730055 }, /* MPEG layer 3 */
-    { CODEC_ID_MP2, 0x5500736D }, /* MPEG layer 3 *//* XXX: check endianness */
+    { CODEC_ID_MP2, MKTAG('m', 's', 0x00, 0x55) }, /* MPEG layer 3 *//* XXX: check endianness */
 
 /*  { CODEC_ID_OGG_VORBIS, MKTAG('O', 'g', 'g', 'S') }, *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */