From 49553ec8657a9ff6935ee95fb166c73331fd8db5 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Wed, 31 Mar 2010 00:41:31 +0000
Subject: Better documentation of -vsync

Originally committed as revision 22739 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 doc/ffmpeg-doc.texi | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'doc')

diff --git a/doc/ffmpeg-doc.texi b/doc/ffmpeg-doc.texi
index 4a5f8d0bd9..a2d7dc290e 100644
--- a/doc/ffmpeg-doc.texi
+++ b/doc/ffmpeg-doc.texi
@@ -757,8 +757,15 @@ Repeatedly loop output for formats that support looping such as animated GIF
 @item -threads @var{count}
 Thread count.
 @item -vsync @var{parameter}
-Video sync method. Video will be stretched/squeezed to match the timestamps,
-it is done by duplicating and dropping frames. With -map you can select from
+Video sync method.
+0   Each frame is passed with its timestamp from the demuxer to the muxer
+1   Frames will be duplicated and droped to achive exactly the requested
+    constant framerate.
+2   Frames are passed through with their timestamp or droped so as to prevent
+    2 frames having the same timestamp
+-1  Chooses between 1 and 2 depending on muxer capabilities. This is default.
+
+With -map you can select from
 which stream the timestamps should be taken. You can leave either video or
 audio unchanged and sync the remaining stream(s) to the unchanged one.
 @item -async @var{samples_per_second}
-- 
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