Intel Media SDK use hw and vpp to convert rgb to yuv420 quality bad

[X_T_1]

Use the sdk tool:

sample_vpp.exe -lib hw -sw 100 -sh 100 -scc rgb4 -dw 100 -dh 100 -dcc nv12 -d3d -i input.rgb32 -o output_hw.yuv

sample_vpp.exe -lib sw -sw 100 -sh 100 -scc rgb4 -dw 100 -dh 100 -dcc nv12 -d3d -i input.rgb32 -o output_sw.yuv

Compare hardware and software to use vpp to convert rgb to yuv420, the hw yuv420 quality is worse than sw. 

The hw seem yuv420 sample the four pixel in the upper left corner, and SW sample the pixel average.

How to adjust the HW parameters to the same effect as SW?

[Ramashankar]

Hi X.T.

https://software.intel.com/en-us/forums/intel-media-sdk/topic/657754

I am also facing quite similar issue from last year due to difference in HW & SW implementation of vpp. I am still awaiting for a solution of this. Hope we may get it now.

[X_T_1]

Hi Ramashankar

It's the same problem with you. Hope intel fix this probelm now.

Best Regards
Tony