Is there a way to crop in VAAPI?

[Yan Wang]

On 8/3/2019 9:25 PM, Nicolas Dufresne-5 [via GStreamer-devel] wrote:
> Le vendredi 02 août 2019 à 20:45 -0500, kmliu a écrit :
>
> > I need to decode H.264 video via VAAPI and then extract the decoded 
> frames to
> > main memory. Since I intend to crop the frames anyway, I'd like to 
> crop them
> > while they're still in graphics memory, to reduce memory bandwidth
> > consumption. So conceptually, I want to do this:
> >
> > gst-launch-1.0 rtspsrc location=rtsp_uri ! rtph264depay ! 
> vaapih264dec !
> > videocrop left=x right=x top=x bottom=x ! filesink location=video.yuv
> >
> > But I think this will end up copying the whole frames to main memory 
> before
> > cropping it there. It would be nice if vaapipostproc supports cropping?
>
> Another (simplier) option is to use gltransformation, but apparently
> not all distro ship this plugin.

May I add the crop option for vaapih264dec?

It may be more direct.

Thanks.

Yan Wang


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