Is there a way to crop in VAAPI?

[Michael Olbrich]

On Mon, Aug 05, 2019 at 12:29:33PM -0500, kmliu wrote:
> > If I read the code correctly, then vaapipostproc already suppports>
> GstVideoCropMeta. So I think you could do ... ! vaapih264dec !>
> vaapipostproc ! ... and add a pad probe that adds the crop meta to each>
> buffer.> MichaelIsn't GstVideoCropMeta just a tag that "tells" the
> downstream elements that the frame should be cropped? I'm not sure if it
> would reduce the amount of data copied from graphics memory to main memory.

No, it contains a rectangle that describes the core area[1]. From what I
can see in the vaapipostproc code, this cropping is applied during the
transformation.

Michael

[1] https://gstreamer.freedesktop.org/documentation/video/gstvideometa.html?gi-language=c#GstVideoCropMeta

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