Re: [FFmpeg-devel] [PATCH 3/3] doc/filters: mentions that whitespaces are ignored in the filtergraph specification

[Gyan Doshi <ffmpeg@gyani.pro>]

On 2023-03-26 11:04 pm, Stefano Sabatini wrote:
> Also provide example showing how to use this feature to improve filtergraph
> readability.

LGTM.

Regards,
Gyan

>
> Address issue:
> http://trac.ffmpeg.org/ticket/8115
> ---
>   doc/filters.texi | 17 +++++++++++++++++
>   1 file changed, 17 insertions(+)
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 1c9d523340..889de8b11a 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -214,6 +214,23 @@ In a complete filterchain all the unlabelled filter input and output
>   pads must be connected. A filtergraph is considered valid if all the
>   filter input and output pads of all the filterchains are connected.
>   
> +Leading and trailing whitespaces (space, tabs, or line feeds) separating tokens
> +in the filtergraph specification are ignored. This means that the filtergraph
> +can be expressed using empty lines and spaces to improve redability.
> +
> +For example, the filtergraph:
> +@example
> +testsrc,split[L1],hflip[L2];[L1][L2] hstack
> +@end example
> +
> +can be represented as:
> +@example
> +testsrc,
> +split [L1], hflip [L2];
> +
> +[L1][L2] hstack
> +@end example
> +
>   Libavfilter will automatically insert @ref{scale} filters where format
>   conversion is required. It is possible to specify swscale flags
>   for those automatically inserted scalers by prepending

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