From c2902c9c66da8c5625eefc1c5a7fa277da254410 Mon Sep 17 00:00:00 2001
From: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Date: Mon, 1 Dec 2008 08:27:53 +0000
Subject: [PATCH] Improve documentation for the -pass and -passlog options. Add
mention to how the log file is used and specify the default log file name.
Originally committed as revision 15969 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
doc/ffmpeg-doc.texi | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/doc/ffmpeg-doc.texi b/doc/ffmpeg-doc.texi
index 6f354c5b00c..9a1de25253a 100644
--- a/doc/ffmpeg-doc.texi
+++ b/doc/ffmpeg-doc.texi
@@ -439,10 +439,11 @@ tell that the raw codec data must be copied as is.
Use same video quality as source (implies VBR).
@item -pass @var{n}
-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.
+Select the pass number (1 or 2). It is used to do two-pass
+video encoding. The statistics of the video are recorded in the first
+pass into a log file (see also the option -passlogfile),
+and in the second pass that log file is used to generate the video
+at the exact requested bitrate.
On pass 1, you may just deactivate audio and set output to null,
examples for Windows and Unix:
@example
@@ -451,7 +452,9 @@ 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}.
+Set two-pass log file name to @var{file}. Default name is
+@file{ffmpeg2pass-N.log}, where N is a number specific to the output
+stream.
@item -newvideo
Add a new video stream to the current output stream.
--
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