According to https://docs.microsoft.com/en-us/windows/desktop/medfound/10-bit-and-16-... P010 stores values left shifted 6 bits, as if the values were originally 16 bits, but Intel Media SDK doesn't shift the values. Bot HW and SW decoding in kaby lake behave the same. https://software.intel.com/en-us/forums/intel-media-sdk/topic/731469 mentions that HW decoding used to be correct. Repro:
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curl http://jell.yfish.us/media/jellyfish-3-mbps-hd-hevc-10bit.mkv --output jelly.mkv
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ffmpeg -i jelly.mkv -vcodec copy -an -bsf hevc_mp4toannexb -vframes 1 jelly.265
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simple_decode_hevc10.exe jelly.265 mfx.yuv
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ffmpeg -i jelly.265 -pix_fmt p010le p010le.yuv
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ffmpeg -i jelly.265 -pix_fmt yuv420p10le yuv420p10le.yuv
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ffmpeg -i jelly.265 -pix_fmt yuv420p16le yuv420p16le.yuv
mfx.yuv should equal p010le.yuv but actually equals yuv420p10le.yuv (the Y plane is identical but mfx.yuv interleaves U/V like NV12 and yuv420p10le.yuv stores all Us before all Vs). As expected the Y plane of yuv420p16le.yuv equals the Y plane of p010le.yuv, while the later interleaves U/V.
Bruno