Community
cancel
Showing results for 
Search instead for 
Did you mean: 
john_h_1
Beginner
97 Views

HEVC decode performance

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.

0 Kudos
0 Replies
Reply