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doc/filters: mentions that whitespaces are ignored in the filtergraph specification
Also provide example showing how to use this feature to improve filtergraph readability. Address issue: http://trac.ffmpeg.org/ticket/8115
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@ -214,6 +214,23 @@ In a complete filterchain all the unlabelled filter input and output
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pads must be connected. A filtergraph is considered valid if all the
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filter input and output pads of all the filterchains are connected.
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Leading and trailing whitespaces (space, tabs, or line feeds) separating tokens
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in the filtergraph specification are ignored. This means that the filtergraph
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can be expressed using empty lines and spaces to improve redability.
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For example, the filtergraph:
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@example
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testsrc,split[L1],hflip[L2];[L1][L2] hstack
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@end example
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can be represented as:
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@example
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testsrc,
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split [L1], hflip [L2];
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[L1][L2] hstack
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@end example
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Libavfilter will automatically insert @ref{scale} filters where format
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conversion is required. It is possible to specify swscale flags
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for those automatically inserted scalers by prepending
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