Look a little closer.
Compare the frame, then read the curve. Perceptual metrics inform a decision; your eyes finish it.
Drag the split, switch with 1 / 2, or lock to native pixels. Focus a comparison to use its keyboard controls.
Frame pairs 2
LOCAL SVG DEMONSTRATIONSArchitectural edges & lineart
BD sourceHEVC encodeIllustrative close-up: watch the window edges and fine grain while toggling. Use native pixel view to avoid browser scaling.
1 / 2 toggle · ← / → switch · native view scrolls at original image sizeNight gradients & fine texture
BD sourceAV1 encodeSVG demonstration: compare the subtle texture in the sky and the edges of the observatory. These are illustrative frames, not measurements of the anime.
1 / 2 toggle · ← / → switch · native view scrolls at original image sizeRate–distortion notebook 1
SVT-AV1-PSY vs x265
Illustrative data only · a short 1080p animation study. These invented values demonstrate the chart and do not support encoder performance claims.
Higher scores indicate greater fidelity. Butteraugli uses the opposite direction: lower is better.
↳ Compare quality at a shared bitrate; CRF scales differ between encoders.
↳ Lower Butteraugli is better. FPS measures speed, not fidelity.
↳ Replace this dataset with measured values and include software versions and hardware.
Inspect the underlying data 8 SAMPLES
| Encoder | CRF | Preset | kb/s | SSIMULACRA 2 | VMAF | Butteraugli | PSNR | FPS |
|---|---|---|---|---|---|---|---|---|
| SVT-AV1-PSY · preset 4 | 18 | 4 | 2800 | 91.2 | 98.1 | 0.62 | 44.2 | 31 |
| SVT-AV1-PSY · preset 4 | 22 | 4 | 2050 | 86.4 | 96.4 | 0.89 | 41.8 | 36 |
| SVT-AV1-PSY · preset 4 | 26 | 4 | 1440 | 79.1 | 93.7 | 1.28 | 38.9 | 41 |
| SVT-AV1-PSY · preset 4 | 30 | 4 | 980 | 70.5 | 89.2 | 1.83 | 36.1 | 47 |
| x265 · slow | 14 | slow | 3450 | 90.5 | 97.6 | 0.69 | 44.2 | 18 |
| x265 · slow | 18 | slow | 2640 | 85.7 | 95.9 | 0.96 | 41.8 | 21 |
| x265 · slow | 22 | slow | 1880 | 78.2 | 93.2 | 1.35 | 38.9 | 26 |
| x265 · slow | 26 | slow | 1320 | 68.7 | 88.7 | 1.9000000000000001 | 36.1 | 30 |