From 646d3fa15f1eba331b97ea35b8c7f870ea83281a Mon Sep 17 00:00:00 2001 From: Brandon Thomas Date: Sat, 3 Oct 2026 05:21:39 -0400 Subject: [PATCH] M13.4: hevcenc README measurements Co-Authored-By: Claude Opus 5.5 --- crates/hevcenc/README.md | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/crates/hevcenc/README.md b/crates/hevcenc/README.md index a008cd03..5c4e5deb 100644 --- a/crates/hevcenc/README.md +++ b/crates/hevcenc/README.md @@ -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