live-presentation-modeling: category [3] refetch policy is realized as the
pure §6.3.4 cadence (mediaPlaylistReloadDelay) + delayedReschedule +
RecurringRunner, fetch scheduling per-track. Record the decided error
semantics — a failed reload's rejection propagates and ends the recurrence;
transient-fetch retry is deferred to network-resilience, kept out of the
cadence — and mark the [3] placement open question decided.
ll-hls-support: note that regular-live change-detection keys off the
full-segment signature, so a parts-only update reads as unchanged; LL-HLS
must fold part progression into change-detection or switch to blocking reload.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Two decision docs for the live-HLS timeline work:
- mse-timestamp-offset — native-PTS default for live; timestampOffset reserved
for relocation (the manifest→buffer / encoded layer).
- live-timeline-anchoring — align demuxed tracks and recover turnover via PDT,
not sequence number (the manifest layer).
Resolve open questions [4] (sync anchor) and turnover startTime recovery in
live-presentation-modeling, pointing at the decisions.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Companion to presentation-modeling.md for streams that change over
time (live / DVR / event). Spine is a category decomposition that
keeps data separated by change-rate and consumer: content snapshot
(snapshot/merge segment identity via media-sequence + URL/byteRange),
streamType, completeness-as-duration, refetch policy as its own
category, the PROGRAM-DATE-TIME sync anchor, and the derived consumer
surface. Captures the debated decisions and open questions; scopes to
sliding-window live (LL-HLS / DVR / discontinuity / timestampOffset
deferred). Adds the reciprocal companion link in presentation-modeling.md.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
