Fix opening of multiple files with ffmpeg SVN

(this is a revert of ffmpeg [7589])

extras/contrib/src/Makefile

@@ -899,6 +899,7 @@ DISTCLEAN_PKG += libmatroska-$(LIBMATROSKA_VERSION).tar.bz2
 
 ffmpeg:
 	$(SVN) export $(FFMPEG_SVN)  ffmpeg
+	(cd "$@" && patch -p1 < ../Patches/ffmpeg-svn-nofile.patch)
 ifeq ($(HOST),i586-pc-beos)
 	(cd $@; patch -p0 < ../Patches/ffmpeg-svn-beos.patch)
 endif

extras/contrib/src/Patches/ffmpeg-svn-nofile.patch

+Index: ffmpeg/libavformat/utils.c
+===================================================================
+--- ffmpeg/libavformat/utils.c	(révision 7907)
++++ ffmpeg/libavformat/utils.c	(copie de travail)
+@@ -282,7 +282,7 @@
+     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) {