Below The Convex Hull
Netflix replaced its one-size-fits-all bitrate ladder (for example 1080p pinned at 5800 kbps for every title) with a per-title ladder. For each title they run trial encodes at several resolutions and quantizer settings, measure quality against the source after upscaling back to display resolution, and keep only the points on the upper envelope of the resulting curves.
A complex action title measures like this:
| Bitrate (kbps) | 480p | 720p | 1080p |
|---|---|---|---|
| 560 | 36.1 | 35.2 | 33.4 |
| 1500 | 38.4 | 39.1 | 37.6 |
| 3000 | 39.6 | 41.8 | 42.3 |
| 4500 | 40.1 | 42.9 | 44.8 |
Which resolution belongs on this title's ladder at the 1500 kbps rung?
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