v10/internal/design/spf/features/container-support.md

status, date, definition

status	date	definition
draft	2026-05-20	coarse

Container support

Support HLS media containers that cannot be appended directly to the selected browser pipeline.

Proposed direction

• Keep container recognition separate from codec capability probing.
• Prefer native append when supported.
• Put required transmuxing behind a media transformation boundary before append.
• Preserve timestamps, captions, and metadata through transformation.

Before implementation

Choose the first required container and measure bundle, worker, and memory costs. Verify discontinuities, encrypted content boundaries, captions, and mixed-container playlists.

Related

Capability probing and non-zero PTS support.