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Add examples in documentation showing how to avoid to decode audio and

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output video in pass 1 for 2-pass encoding.
Patch by Erwan Ducroquet erwan _dot_ ducroquet _at_ gmail _dot_ com

Originally committed as revision 14736 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Erwan Ducroquet 2008-08-13 19:49:37 +00:00 committed by Stefano Sabatini
parent 06cddea060
commit 850a8d42ab
1 changed files with 6 additions and 0 deletions
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doc/ffmpeg-doc.texi
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@ -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}.