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| -rw-r--r-- | doc/ffmpeg-doc.texi | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/doc/ffmpeg-doc.texi b/doc/ffmpeg-doc.texi index 6f354c5b00..9a1de25253 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. |