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HD Instant Replay Performance Benchmarking

Performance Testing

Andrew's Desktop

Experiment Setup

• 2x Opteron 4180 2.6GHz
• 16GB RAM (8GB per CPU).
• Asus KCMA-D8 motherboard.
• Testing with complete sports intro (1,978 frames) at 1920x1080.
• Sending RGB data as YUV data (because FFmpeg is stupid). UYVY (4:2:2) -> YUV (4:4:4) conversion bypassed. Used libjpeg_turbo for testing.

Test Results

• Single thread: avg 45.0 fps.
• Two threads: (both CPU saturated) 47.0 fps, 45.0 fps
• Eight threads: 38.9, 39.3, 39.3, 39.4, 39.4, 38.8, 39.7, 39.0

Conclusions

• The processor is fast. My code is not optimized.
• Average bitrate on a "random sample" of sports footage (i.e. the sports intro): 31,085 Kbps - at a rather low jpeg quality setting. Of course, M-JPEG is VBR...

Codec Notes

• libjpeg wants planar image data. An SSE routine should be constructed to convert packed UYVY data to planar YUV 4:2:2 data. This should improve speed and also image quality. See the section in the manual on "raw (downsampled) data".
• Some thought should be given to preview; a good way to do that remains unknown.