[FFmpeg-devel] [PATCH] lavfi/overlay: add dynamic x/y expression evaluation support

[Clément Bœsch]

On Mon, Apr 08, 2013 at 08:12:22PM +0200, Stefano Sabatini wrote:
[...]
> From f7894f04e5dfe49f8ae60fe02d5a19bdba7e32aa Mon Sep 17 00:00:00 2001
> From: Stefano Sabatini <stefasab at gmail.com>
> Date: Tue, 19 Feb 2013 20:10:02 +0100
> Subject: [PATCH] lavfi/overlay: add dynamic expression evaluation support
> 
> Add support for dynamic x, y expressions evaluation.
> 
> Also add support for an evaluation mode which allows to disable per-frame
> evaluation, so that there is no speedloss in case the expression does not
> depend on frame variables.
> 
> TODO: bump micro
> ---
>  doc/filters.texi         |   81 ++++++++++++++++++++++++-------
>  libavfilter/vf_overlay.c |  120 +++++++++++++++++++++++++++++++++-------------
>  2 files changed, 150 insertions(+), 51 deletions(-)
> 
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 630db43..7ffb30e 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -5,7 +5,7 @@ Filtering in FFmpeg is enabled through the libavfilter library.
>  
>  In libavfilter, it is possible for filters to have multiple inputs and
>  multiple outputs.
> -To illustrate the sorts of things that are possible, we can
> +To illustrate the sorts of things that are possible, we cyesan

Your keyboard doesn't feel good.

>  use a complex filtergraph. For example, the following one:
>  
>  @example
> @@ -4243,26 +4243,31 @@ arguments are interpreted according to the syntax @var{x}:@var{y}.
>  A description of the accepted options follows.
>  
>  @table @option
> - at item x, y
> + at item x
> + at item y
>  Set the expression for the x and y coordinates of the overlayed video
> -on the main video. Default value is 0.
> -
> -The @var{x} and @var{y} expressions can contain the following
> -parameters:
> - at table @option
> - at item main_w, main_h
> -main input width and height
> +on the main video. Default value is "0" for both expressions. In case
> +the expression is invalid, it is set to a huge value (meaning that the
> +overlay will not be displayed within the output visible area).
>  
> - at item W, H
> -same as @var{main_w} and @var{main_h}
> + at item eval
> +Set when the expressions for @option{x} and @option{y} are evaluated.
>  

Did you really split eval/enable?

[...]

-- 
Clément B.
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