avio: flush the internal buffer in avio_close()

This is consistent with stdio, and thus what people would naturally
expect.

1 files changed, 3 insertions, 0 deletions

diff --git a/libavformat/avio.h b/libavformat/avio.h
index 10c0a12ccb..55c96bc432 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -349,6 +349,9 @@ int avio_open2(AVIOContext **s, const char *url, int flags,
  * Close the resource accessed by the AVIOContext s and free it.
  * This function can only be used if s was opened by avio_open().
  *
+ * The internal buffer is automatically flushed before closing the
+ * resource.
+ *
  * @return 0 on success, an AVERROR < 0 on error.
  */
 int avio_close(AVIOContext *s);