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doc/indevs: update syntax for the color filter in the lavfi device examples
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@ -341,14 +341,14 @@ the option @var{graph}.
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@item
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Create a color video stream and play it back with @command{ffplay}:
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@example
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ffplay -f lavfi -graph "color=pink [out0]" dummy
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ffplay -f lavfi -graph "color=c=pink [out0]" dummy
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@end example
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@item
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As the previous example, but use filename for specifying the graph
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description, and omit the "out0" label:
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@example
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ffplay -f lavfi color=pink
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ffplay -f lavfi color=c=pink
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@end example
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@item
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