Crate viser_ladder 

Bitrate ladder selection with crossover enforcement.

Picks the best N rungs from a convex hull (Pareto frontier) using greedy VMAF-target selection, while enforcing resolution crossovers and bitrate/quality constraints. Also provides pre-built fixed ladders (Netflix, Apple HLS) for baseline comparison.

Part of the viser video-encoding-optimizer workspace.

Structs

FixedLadder

A fixed (non-optimized) bitrate ladder for comparison.

FixedRung

A single rung of a fixed ladder: a resolution paired with a bitrate.

Ladder

Ordered set of rungs from lowest to highest quality.

Opts

Constraints and target count controlling ladder selection.

Rung

One level in a bitrate ladder.

Functions

apple_hls

Apple’s HLS encoding recommendations (approximate, 2024).

netflix_old

Netflix’s original fixed bitrate ladder (2015).

select

Picks the best N rungs from the convex hull to form a bitrate ladder.