lavf/mux: add avformat_init_output

This allows a consumer to run the muxer's init function without actually
writing the header, which is useful in chained muxers that support
automatic bitstream filtering.

1 files changed, 10 insertions, 0 deletions

diff --git a/libavformat/internal.h b/libavformat/internal.h
index 95776a09f5..da64c641a7 100644
--- a/libavformat/internal.h
+++ b/libavformat/internal.h
@@ -130,6 +130,16 @@ struct AVFormatInternal {
      * Timestamp of the end of the shortest stream.
      */
     int64_t shortest_end;
+
+    /**
+     * Whether or not avformat_init_output has already been called
+     */
+    int initialized;
+
+    /**
+     * Whether or not avformat_init_output fully initialized streams
+     */
+    int streams_initialized;
 };
 
 struct AVStreamInternal {