diff -r 7a93143dbf53 -r 9ea67efc1fac video.rst
--- a/video.rst	Tue Aug 14 16:19:43 2012 +0300
+++ b/video.rst	Tue Aug 14 16:20:34 2012 +0300
@@ -50,6 +50,12 @@
   http://wiki.debian.org/Webcam
                 Debian wiki.
 
+Extract audio from video file.
+==============================
+::
+
+  $ mplayer -ao pcm:fast:file=audio.wav -vc null -vo null  input.avi
+
 Synchronise video and audio streams.
 ====================================
 ::