liveWindowFor is now {start, end}; the holdback rule lives in liveLatencyFor
and reaches seek-to-live-edge via the resolveLiveLatency seam + getLiveEdge.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Reframe the "clearLiveSeekableRange() on termination" follow-up as a
deliberate non-action rather than a gap. Per the W3C MSE spec, the live
seekable range is consulted only while duration === Infinity; when a live
stream ends, endOfStream() sets a finite duration and the UA derives seekable
from buffered + duration, ignoring the live range — so clearing is unnecessary.
Clearing on the ENDLIST->finite-Track.duration transition would also be
premature (duration is still Infinity until endOfStream) and shrink seekable to
buffered-only. No logic change; the existing behavior (bail on null window) is
already correct, and the 'no-ops for a complete playlist' test locks it.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Update the Implementation surface + live-edge phase row to attribute
setLiveSeekableRange to syncLiveSeekableRange and the window derivation to the
pure liveWindowFor helper, rather than the (now leaner) seekToLiveEdge.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Promote the live-window playhead guard phase from planned to implemented
(window-exit reposition in seek-to-live-edge): update the Status block, phase
row, What's-not-implemented, Implementation/Config surface, and Verification
(landed unit matrix; e2e deferred). Record the resolved seam-shape decision
(behavior-scoped repositionPolicy, not a public engine-config field) and guard
placement (extends seek-to-live-edge).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Bump live-stream-support to sketched depth grounded in feat/spf-hls-live
(reload loop, sliding-window tracking, Infinity duration, live-edge seek,
ENDLIST termination all implemented); resolve its 5 open questions. Add the
planned live-window playhead guard (reposition on window-exit, covering
paused-too-long and fallen-behind) with a repositionPolicy seam for a future
edge-only composition.
Cascade: register [live-edge-only-mode] use-case candidate; cross-ref
buffer-stall-recovery (in-window stall vs window-exit reposition) and
dvr-event-stream-support (seekable spectrum).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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>
Feedback from @decepulis treated as a fast follow/incremental improvement effort for expediency.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
