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25 lines
856 B
Markdown
25 lines
856 B
Markdown
---
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status: draft
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date: 2026-05-20
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definition: technical
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---
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# Rendition selection caps
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Apply application and device constraints before adaptive ranking chooses a video rendition.
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## Proposed direction
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- Express caps as composable candidate constraints.
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- Keep capability exclusions mandatory and policy caps configurable.
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- Support viewport, resolution, bitrate, and customer limits without coupling to DOM reads.
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- Define a fallback when constraints remove every candidate.
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## Before implementation
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Specify constraint precedence, update frequency, fallback semantics, and interaction with manual selection. Test conflicting caps, resize, device-pixel ratio, and an empty candidate set.
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## Related
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[Multi-signal ABR](./multi-signal-abr.md), [HEVC variant selection](./hevc-variant-selection.md), and [capability probing](./capability-probing.md).
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