[FFmpeg-cvslog] lavf/concat: document the use of the files durations.

[Nicolas George]

ffmpeg | branch: master | Nicolas George <nicolas.george at normalesup.org> | Tue Mar  5 17:14:27 2013 +0100| [87a954d6f4e3cfbd533ac381e95df96683070397] | committer: Nicolas George

lavf/concat: document the use of the files durations.

Address trac ticket #2319.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=87a954d6f4e3cfbd533ac381e95df96683070397
---

 doc/demuxers.texi |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index c8eec21..f9c86e7 100644
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -44,6 +44,12 @@ length.
 
 All files must have the same streams (same codecs, same time base, etc.).
 
+The duration of each file is used to adjust the timestamps of the next file:
+if the duration is incorrect (because it was computed using the bit-rate or
+because the file is truncated, for example), it can cause artifacts. The
+ at code{duration} directive can be used to override the duration stored in
+each file.
+
 @subsection Syntax
 
 The script is a text file in extended-ASCII, with one directive per line.