Bitrate modes that pass at the probed export size (empty when unsupported).
The RFC string the export would ENCODE with for this codec: the first supported rung of the
fallback ladder (user-forced string first, then the built-in ladder in preferred order). null when no rung
is supported.
Whether a prefer-hardware configuration passes. null when it couldn't be probed
(codec unsupported or WebCodecs unavailable).
Standard-ladder resolutions, each marked supported/unsupported for this codec.
Every candidate rung in the order the encoder tries them (forced first, then the built-in ladder), each with its own support result — the input a UI needs to show what will actually be used and what was skipped.
Whether ANY rung has a working encoder configuration at the probed export size.
Probed supported bitrate interval (bps) at the export size: the lowest and highest passing probe points.
nullbounds when the codec is unsupported.