fix MPEG-TS missdetected as MPEG-PS

Originally committed as revision 2194 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mpeg.c

@@ -429,7 +429,7 @@ static int mpegps_probe(AVProbeData *p)
                 code == PROGRAM_STREAM_MAP ||
                 code == PRIVATE_STREAM_1 ||
                 code == PADDING_STREAM)
-                return AVPROBE_SCORE_MAX - 1;
+                return AVPROBE_SCORE_MAX - 2;
             else
                 return 0;
         }