fix missdetection of mpeg-ps (ps2_interdite.mpg)

Originally committed as revision 6948 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mp3.c

@@ -256,7 +256,7 @@ static int mp3_read_probe(AVProbeData *p)
         return 0;
 
     if(id3_match(p->buf))
-        return AVPROBE_SCORE_MAX;
+        return AVPROBE_SCORE_MAX/2+1; // this must be less then mpeg-ps because some retards put id3 tage before mpeg-ps files
 
     max_frames = 0;
     buf = p->buf;