added parsing

Originally committed as revision 2498 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mp3.c

@@ -253,7 +253,8 @@ static int mp3_read_header(AVFormatContext *s,
 
     st->codec.codec_type = CODEC_TYPE_AUDIO;
     st->codec.codec_id = CODEC_ID_MP3;
-
+    st->need_parsing = 1;
+    
     /* try to get the TAG */
     if (!url_is_streamed(&s->pb)) {
         /* XXX: change that */