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HEVC decode performance

john_h_1
Beginner
‎03-16-2017 03:06 PM
691 Views

We are bench marking HEVC decode performance on an i7-7700K Kaby Lake (4.2GHz), with 32GB of DDR4.  We just installed the latest 2017 Media SDK (LInux). We use ffmpeg with the hevc_qsv codec.

The video input streams are HEVC 4K (3840x2160), 10-bit, 100Mbps, 60fps. Our output format is v210 (422, 10-bit). Our output destination is just "-f null -" so the only I/O should just be reading the encoded file from an SSD.  E.g.,

        ffmpeg -y -benchmark -hwaccel qsv -i Videos/uhd100b.ts -vcodec v210  -f null -

We were hoping/expecting to see decode rates at or better than real-time. However, ffmpeg reports "speed" at about 0.70x. The CPU load is evenly distributed over 8 cores, at about 55% per core. What performance should we expect?

Thanks in advance for any insight.

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