Revision dd08b83c doc/libavfilter.texi

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doc/libavfilter.texi
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./ffmpeg -i in.avi -vfilters "vflip" out.avi
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@end example
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@chapter Available video sources
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Below is a description of the currently available video sources.
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@section nullsrc
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Null video source, never return images. It is mainly useful as a
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template and to be employed in analysis / debugging tools.
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It accepts as optional parameter a string of the form
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``width:height'', where ``width'' and ``height'' specify the size of
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the configured source.
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The default values of ``width'' and ``height'' are respectively 352
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and 288 (corresponding to the CIF size format).
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@bye

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