[FFmpeg-devel] [PATCH] avfilter/vf_crop: make it possible to use frame metadata when cropping

[Stefano Sabatini]

On date Sunday 2016-01-17 20:15:45 +0100, Paul B Mahol encoded:
> Signed-off-by: Paul B Mahol <onemda at gmail.com>
> ---
>  doc/filters.texi      |  6 ++++++
>  libavfilter/vf_crop.c | 54 +++++++++++++++++++++++++++++++++++++++------------
>  2 files changed, 48 insertions(+), 12 deletions(-)
> 
> diff --git a/doc/filters.texi b/doc/filters.texi
> index f4bda6a..aee4e66 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -4621,6 +4621,11 @@ This expression is evaluated per-frame.
>  If set to 1 will force the output display aspect ratio
>  to be the same of the input, by changing the output sample aspect
>  ratio. It defaults to 0.
> +

> + at item metadata
> +If set to 1 it will use frame metadata instead to obtain all parameters.
> +To make use of this feature you need to start @ref{cropdetect} filter before
> +this filter.

Suggestion: to make this more extensible, allow to set the metadata
fields to read, for example so that you can have something like:
metadata=facedetect or metadata=cropdetect.

[...]
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