@@ -780,6 +780,40 @@ Set the maximum demux-decode delay.

 Set the initial demux-decode delay.

 @end table

+@section Preset files

+

+A preset file contains a sequence of @var{option}=@var{value} pairs,

+one for each line, specifying a sequence of options which would be

+awkward to specify on the command line. Lines starting with the hash

+('#') character are ignored and are used to provide comments. Check

+the @file{ffpresets} directory in the FFmpeg source tree for examples.

+

+Preset files are specified with the @code{vpre}, @code{apre} and

+@code{spre} options. The options specified in a preset file are

+applied to the currently selected codec of the same type as specified

+by the preset option.

+

+The argument passed to the preset options identifies the preset file

+to use according to the following rules.

+

+First ffmpeg searches for a file named @var{arg}.ffpreset in the

+directories @file{$HOME/.ffmpeg}, @file{/usr/local/share/ffmpeg} and

+@file{/usr/share/ffmpeg} in that order. For example, if the argument

+is @code{libx264-max}, it will search for the file

+@file{libx264-max.ffpreset}.

+

+If no such file is found, then ffmpeg will search for a file named

+@var{codec_name}-@var{arg}.ffpreset in the above-mentioned

+directories, where @var{codec_name} is the name of the codec to which

+the preset file options will be applied. For example, if you select

+the video codec with @code{-vcodec libx264} and use @code{-vpre max},

+then it will search for the file @file{libx264-max.ffpreset}.

+

+Finally, if the above rules failed and the argument specifies an

+absolute pathname, ffmpeg will search for that filename. This way you

+can specify the absolute and complete filename of the preset file, for

+example @file{./ffpresets/libx264-max.ffpreset}.

+

 @node FFmpeg formula evaluator

 @section FFmpeg formula evaluator