@@ -429,6 +429,12 @@ Select the pass number (1 or 2). It is useful to do two pass

 encoding. The statistics of the video are recorded in the first

 pass and the video is generated at the exact requested bitrate

 in the second pass.

+On pass 1, you may just deactivate audio and set output to null,

+examples for Windows and Unix:

+@example

+ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y NUL

+ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y /dev/null

+@end example

 @item -passlogfile @var{file}

 Set two pass logfile name to @var{file}.