[FFmpeg-devel] [PATCH 2/2] lavfi: add tile video filter. (WIP)

[Clément Bœsch]

On Thu, Feb 23, 2012 at 02:44:27PM +0100, Nicolas George wrote:
> 
> Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
> ---
>  doc/filters.texi         |   10 ++
>  libavfilter/Makefile     |    1 +
>  libavfilter/allfilters.c |    1 +
>  libavfilter/vf_tile.c    |  225 ++++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 237 insertions(+), 0 deletions(-)
>  create mode 100644 libavfilter/vf_tile.c
> 

Nice, do you plan to use it in combination of a scenedetect video filter?

> 
> There are still two problems with that filter:
> 
> - When using ffmpeg -i file -vf tile ... the last incomplete frame is not
>   flushed. Apparently, ffmpeg does not try to poll the filtergraph after it
>   has fed it the last decoded frame.
> 
> - When using -f lavfi, the last incomplete frame is flushed, but the empty
>   frames, instead of being blank, keep the content they had on the last
>   frame. This one is easy to fix, but it requires some extension/cleanup of
>   the drawutils API, and it is sorely lacking documentation.
> 
> Apart from that, it does work.
> 
> Regards,
> 
> -- 
>   Nicolas George
> 
> 
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 238401a..9487a31 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -2597,6 +2597,16 @@ Complete example of a thumbnail creation with @command{ffmpeg}:
>  ffmpeg -i in.avi -vf thumbnail,scale=300:200 -frames:v 1 out.png
>  @end example
>  
> + at section tile
> +
> +Tile several successive frames together.
> +
> +It accepts as argument the tile size in the form "@var{w}:@var{h}".
> +

Isn't it the number of columns/lines of tiles instead?

[...]

-- 
Clément B.
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