Is there a way to crop in VAAPI?

[Nicolas Dufresne]

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.

> 
> 
> 
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