avformat/mpeg: Adjust vid probe threshold to correct mis-detection

Fixes: _ij.mp3
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 4e5049a2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/mpeg.c

@@ -112,7 +112,7 @@ static int mpegps_probe(AVProbeData *p)
                           : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
     if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
         !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
-        return (audio > 12 || vid > 3 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
+        return (audio > 12 || vid > 6 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
                                                      : AVPROBE_SCORE_EXTENSION / 2;
 
     // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1