Slightly stricter MPEG-PES probing, fixes issue 1383.

Originally committed as revision 19852 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mpeg.c

@@ -82,9 +82,10 @@ static int mpegps_probe(AVProbeData *p)
     if(priv1 + vid + audio > invalid && (priv1+vid+audio)*9 <= pspack*10)
         return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
     if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */
-        return AVPROBE_SCORE_MAX/2+2;
+        return (audio > 12 || vid > 3) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
 
     //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
+    //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
     return score;
 }