Demuxers with AVFMT_NOFILE will open a (possibly different) file themselves,

so do not probe them if is_opened is set.

Originally committed as revision 7589 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -279,7 +279,7 @@ AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened)
     fmt = NULL;
     score_max = 0;
     for(fmt1 = first_iformat; fmt1 != NULL; fmt1 = fmt1->next) {
-        if (!is_opened && !(fmt1->flags & AVFMT_NOFILE))
+        if (!is_opened == !(fmt1->flags & AVFMT_NOFILE))
             continue;
         score = 0;
         if (fmt1->read_probe) {