Re: [FFmpeg-devel] [PATCH v3] area changed: scdet filter

[Tobias Rapp <t.rapp@noa-archive.com>]

On 12/06/2024 21:51, radu.taraibuta@gmail.com wrote:

[...]

> diff --git a/doc/filters.texi b/doc/filters.texi
> index bfa8ccec8b..53814e003b 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -21797,6 +21797,22 @@ Default value is @code{10.}.
>  @item sc_pass, s
>  Set the flag to pass scene change frames to the next filter. Default 
> value is @code{0}
>  You can enable it if you want to get snapshot of scene change frames 
> only.
> +
> +@item mode
> +Set the scene change detection method. Default value is @code{-1}
> +Available values are:
> +
> +@table @samp
> +@item -1
> +Legacy mode for sum of absolute linear differences. Compare frame 
> with previous only and no delay.
> +
> +@item 0
> +Sum of absolute linear differences. Compare frame with both previous 
> and next which introduces a 1 frame delay.
> +
> +@item 1
> +Sum of mean of cubic root differences. Compare frame with both 
> previous and next which introduces a 1 frame delay.
> +
> +@end table
>  @end table
>
>  @anchor{selectivecolor}

Out of curiosity: How do these three modes roughly compare (CPU) 
performance wise?

I'd prefer if mode "-1" could be used for the default case, and the 
three modes get explicit values 0/1/2. Regarding naming I think that the 
"Legacy" mode still has its usecases in the future. Naming it something 
like "simple" would not imply that it is deprecated in general, but 
rather that it has lower precision (and is possibly faster).

Best regards,
Tobias

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