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HEVC hw encoder performance and video quality seems low on skylake

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Hi, Experts

I am trying to run HEVC hw encoder on skylake. The input yup is 1080p ,but the performance  and quality seems not good. 

The CPU type is Intel(R)Core(TM)i3-6100 CPU@3.70G 2 cores cache:128k+512k+4.0M 

But the encoding fps for 1080p is 58fps for speed mode. If it just support 1080p 58fps, does it has capability to support 4K 30fps? And I checked the PSNR of HEVC hw bitstream, and compared to H.264 bitstream encode by intel hw encoder. The HEVC encoder just saved 10% bitrates with the same PSNR.  

Does Intel has any documents to describe the performance and video quality for HEVC hw encoder of skyline?

The test details are as follows:

D:\intel_codec\Release>.\sample_encode.exe h265 -i ..\..\sequence\pedestrian_area_1080p25.yuv -o intel_1024k.265 -w 1920 -h 1080 -hw -r 1 -b 1024 -f 30
plugin_loader.h :164 [INFO] Plugin was loaded from GUID: { 0x6f, 0xad, 0xc7, 0x91, 0xa0, 0xc2, 0xeb, 0x47, 0x9a, 0xb6, 0xdc, 0xd5, 0xea, 0x9d, 0xa3, 0x47 } (Intel (R) Media SDK HW plugin for HEVC ENCODE)
Encoding Sample Version 1.0.0.0

Input file format       YUV420
Output video            HEVC
Source picture:
        Resolution      1920x1088
        Crop X,Y,W,H    0,0,1920,1080
Destination picture:
        Resolution      1920x1088
        Crop X,Y,W,H    0,0,1920,1080
Frame rate      30.00
Bit rate(Kbps)  1024
Gop size        0
Ref dist        1
Ref number      1
Idr Interval    0
Target usage    balanced
Memory type     system
Media SDK impl          hw
Media SDK version       1.17

Processing started
Frame number: 375
Encoding fps: 58plugin_loader.h :190 [INFO] MFXBaseUSER_UnLoad(session=0x00D00830), sts=0

 

 

 


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