probe with some success image files not containing number pattern but having...

probe with some success image files not containing number pattern but having recognized image extension

Originally committed as revision 7219 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/img2.c

@@ -154,10 +154,13 @@ static int find_image_range(int *pfirst_index, int *plast_index,
 
 static int image_probe(AVProbeData *p)
 {
-    if (av_filename_number_test(p->filename) && av_str2id(img_tags, p->filename))
-        return AVPROBE_SCORE_MAX;
-    else
-        return 0;
+    if (av_str2id(img_tags, p->filename)) {
+        if (av_filename_number_test(p->filename))
+            return AVPROBE_SCORE_MAX;
+        else
+            return AVPROBE_SCORE_MAX/2;
+    }
+    return 0;
 }
 
 enum CodecID av_guess_image2_codec(const char *filename){