Created attachment 124398 [details]
YUV data before and after scaling
VA_FILTER_SCALING_HQ NV12 downscaling from 4096x2160 to 176x144 only has a part of the source image. Looks like AVS scaling has some limitation for larger ratio.
Reproduce on both Braswell N3150 and Skylake Core i5-6600 with libyami VPP test application. Please refer to the attached YUV file before and after scaling to get exact phenomenon.
$ git config --global http.sslverify false
$ git clone https://github.com/01org/libyami
$ ./autogen.sh --prefix=/usr –enable-avformat=yes --enable-tests=yes --enable-debu=yes --enable-dmabuf=yes
$ cd tests
$ ./yamivpp 4096x2160_NV12.nv12 output_176x144.nv12
Created attachment 128457 [details]
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Will you please try the latest driver code and see whether it works for you?
The driver adds the new implementation for NV12 scaling.