v10/internal/design/spf/features/audio-abr.md

status, date, definition

status	date	definition
draft	2026-05-20	technical

Audio ABR

Adapt bitrate within the selected audio language or rendition group without changing the user's language intent.

Proposed direction

• Treat language selection as intent and bitrate selection as resolution within that intent.
• Reuse shared bandwidth estimates and the existing audio-track switch path.
• Prefer seamless switches; flush only when the chosen rendition requires it.
• Keep audio and video budgets coordinated when both are present.

Before implementation

Specify grouping, startup selection, hysteresis, and audio/video budget allocation. Test audio-only playback, multiplexed playback, constrained bandwidth, and codec changes.

Related

Multi-language audio, multi-signal ABR, and rendition selection caps.