Is there a way to crop in VAAPI?

[Nicolas Dufresne]

Le lun. 5 août 2019 02 h 55, Yan Wang <yan.wang at linux.intel.com> a écrit :

>
> 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.
>
Sounds wrong to me, and I doubt you'll find an API to support that. If
there is one element in VAAPI that may have an API for this it would be
vaapipostproc.


Thanks.
>
> Yan Wang
>
>
>
> >
> >
> >
> > --
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