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section filtergraph syntax, you can omit the option names and = characters, supplying just the values, delimited by : characters. for example, in this invocation: ffmpeg -i input -vf scale=iw/ : output ffmpeg assumes the option names in the order they are declared in the source code. for instance,
in this use of the scale filter , ffmpeg assumes the option name width for the value iw/ , and the name height for the value . filtergraph, chain, filter relationship what follows the -vf in an ffmpeg command line is a filtergraph description. this filtergraph may contain a number of chains, each of...
http://trac.ffmpeg.org/wiki/FilteringGuide