1 files changed, 10 insertions, 0 deletions
diff --git a/libavformat/mux_utils.c b/libavformat/mux_utils.c
index df264fc6a0..83c1482540 100644
--- a/libavformat/mux_utils.c
+++ b/libavformat/mux_utils.c
@@ -85,6 +85,16 @@ end:
     return ret;
 }
 
+int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options)
+{
+    if (!s->oformat)
+        return AVERROR(EINVAL);
+
+    if (!(s->oformat->flags & AVFMT_NOFILE))
+        return s->io_open(s, &s->pb, url, AVIO_FLAG_WRITE, options);
+    return 0;
+}
+
 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds)
 {
     AVDictionaryEntry *entry;