v10/internal/design/spf/features/non-zero-pts-support.md

status, date, definition

status	date	definition
draft	2026-05-20	technical

Non-zero PTS support

Map media timestamps that begin away from zero onto a stable player presentation timeline.

Proposed direction

• Derive an explicit media-to-presentation offset from parsed timing evidence.
• Apply the mapping consistently to append windows, seeks, duration, and buffered ranges.
• Keep the original media timestamps available for diagnostics.
• Recompute only at defined discontinuity boundaries.

Before implementation

Choose the authoritative timestamp evidence and discontinuity rules. Test positive and negative offsets, audio/video skew, seeks, source replacement, and malformed metadata.

Related

Edit-list compensation and presentation modeling.