ffmpeg roll of source to mar 9 version...

patched-ffmpeg-mt/doc/libavfilter.texi

 \input texinfo @c -*- texinfo -*-
 
 @settitle Libavfilter Documentation
 @titlepage
 @sp 7
 @center @titlefont{Libavfilter Documentation}
 @sp 3
 @end titlepage
 
 
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 and output.
 
 Some filters take in input a list of parameters: they are specified
 after the filter name and an equal sign, and are separated each other
 by a semicolon.
 
 There exist so-called @var{source filters} that do not have a video
 input, and we expect in the future some @var{sink filters} that will
 not have video output.
 
+@chapter graph2dot
+
+The @file{graph2dot} program included in the FFmpeg @file{tools}
+directory can be used to parse a filter graph description and issue a
+corresponding textual representation in the dot language.
+
+Invoke the command:
+@example
+graph2dot -h
+@end example
+
+to see how to use @file{graph2dot}.
+
+You can then pass the dot description to the @file{dot} program (from
+the graphviz suite of programs) and obtain a graphical representation
+of the filter graph.
+
+For example the sequence of commands:
+@example
+echo @var{GRAPH_DESCRIPTION} | \
+tools/graph2dot -o graph.tmp && \
+dot -Tpng graph.tmp -o graph.png && \
+display graph.png
+@end example
+
+can be used to create and display an image representing the graph
+described by the @var{GRAPH_DESCRIPTION} string.
+
 @chapter Available video filters
 
 When you configure your FFmpeg build, you can disable any of the
 existing video filters.
 The configure output will show the video filters included in your
 build.
 
 Below is a description of the currently available video filters.
 
 @section crop
@@ skipping 133 matching lines @@
 
 Below is a description of the currently available video sinks.
 
 @section nullsink
 
 Null video sink, do absolutely nothing with the input video. It is
 mainly useful as a template and to be employed in analysis / debugging
 tools.
 
 @bye