From 37f57ab4dddf463dfb34736a43a13e0eed099742 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 4 Apr 2010 12:20:10 +0000
Subject: [PATCH] Allow AVFormatContext.duration to be set if no individual
 stream duration is known. Demuxers already do this ...

Originally committed as revision 22796 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/avformat.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 22f74b4013..7c7affac07 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -611,8 +611,9 @@ typedef struct AVFormatContext {
        It is deduced from the AVStream values.  */
     int64_t start_time;
     /** Decoding: duration of the stream, in AV_TIME_BASE fractional
-       seconds. NEVER set this value directly: it is deduced from the
-       AVStream values.  */
+       seconds. Only set this value if you know none of the individual stream
+       durations and also dont set any of them. This is deduced from the
+       AVStream values if not set.  */
     int64_t duration;
     /** decoding: total file size, 0 if unknown */
     int64_t file_size;