+static int mkv_check_tag(AVDictionary *m)
+{
+ AVDictionaryEntry *t = NULL;
+ int ret = 0;
+
+ while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
+ if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
+ ret++;
+
+ return ret;
+}
+