[FFmpeg-devel] [PATCH v4 2/7] doc/indevs: Add example using cropping to capture part of a plane

[Song, Ruiling]

> -----Original Message-----
> From: ffmpeg-devel [mailto:ffmpeg-devel-bounces at ffmpeg.org] On Behalf Of
> Mark Thompson
> Sent: Wednesday, April 10, 2019 6:07 AM
> To: ffmpeg-devel at ffmpeg.org
> Subject: [FFmpeg-devel] [PATCH v4 2/7] doc/indevs: Add example using cropping
> to capture part of a plane
> 
> ---
>  doc/indevs.texi | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/doc/indevs.texi b/doc/indevs.texi
> index 1d5ed65773..a4f0f608d7 100644
> --- a/doc/indevs.texi
> +++ b/doc/indevs.texi
> @@ -910,6 +910,14 @@ Capture from CRTC ID 42 at 60fps, map the result to
> VAAPI, convert to NV12 and e
>  ffmpeg -crtc_id 42 -framerate 60 -f kmsgrab -i - -vf
> 'hwmap=derive_device=vaapi,scale_vaapi=w=1920:h=1080:format=nv12' -c:v
> h264_vaapi output.mp4
>  @end example
> 
> + at item
> +To capture only part of a plane the output can be cropped - this can be used to
> capture
> +a single window, as long as it has a known absolute position.  For example, to
					         absolute position and window size?
> capture
> +and encode the middle quarter of a 1920x1080 plane:
> + at example
> +ffmpeg -f kmsgrab -i - -vf
> 'hwmap=derive_device=vaapi,crop=960:540:480:270,scale_vaapi=960:540:nv12'
> -c:v h264_vaapi output.mp4
> + at end example
> +
>  @end itemize
> 
>  @section lavfi
> --
> 2.20.1
> 
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