v10/internal/design/spf/features/rendition-selection-caps.md

status, date, definition

status	date	definition
draft	2026-05-20	technical

Rendition selection caps

Apply application and device constraints before adaptive ranking chooses a video rendition.

Proposed direction

• Express caps as composable candidate constraints.
• Keep capability exclusions mandatory and policy caps configurable.
• Support viewport, resolution, bitrate, and customer limits without coupling to DOM reads.
• Define a fallback when constraints remove every candidate.

Before implementation

Specify constraint precedence, update frequency, fallback semantics, and interaction with manual selection. Test conflicting caps, resize, device-pixel ratio, and an empty candidate set.

Related

Multi-signal ABR, HEVC variant selection, and capability probing.