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M13.4: hevcenc README measurements

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Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Brandon ThomasandClaude Opus 5.5 committed 2026-10-03 05:21:39 -04:00
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@@ -52,10 +52,10 @@ adaptive quantisation, tiles / WPP / multiple slices, range extensions (4:2:2, 4
## Measurements
On a shared, heavily loaded machine, opt-level 3: about 0.45 s of CPU per 1920x1080 picture
(ffmpeg `testsrc2`, QP 22 / 32). On ffmpeg's `mandelbrot` 1080p source at QP 32 the stream is
about 10 % larger at about 0.3 dB lower PSNR-Y than x265 `--preset medium` at the same QP without
psy tuning (I 40.6 kB / 43.2 dB vs 42.3 kB / 43.7 dB). The synthetic test image reaches
45.8 dB PSNR-Y at QP 22.
(ffmpeg `testsrc2`, QP 22 / 32). On ffmpeg's `mandelbrot` 1080p source (8 pictures, IPPP, QP 32)
the stream is about 12 % larger at about 0.2 dB lower mean PSNR-Y than x265 `--preset medium` at
the same QP without psy tuning (110.5 kB / 42.3 dB vs 98.3 kB / 42.5 dB). The synthetic test image
reaches 45.8 dB PSNR-Y at QP 22.
## Tests