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docs(spf): drop stale repositionPolicy references after seam removal

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The repositionPolicy seam was removed when seek-to-live-edge's guard became
reload-driven. Reframe the sibling references: the guard does window-exit, and
the edge-only [live-edge-only-mode] use-case supplies its own reposition
behavior (alternative-impl) rather than flipping a seam.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Christian Pillsbury
2026-06-25 10:00:44 -07:00
co-authored by Claude Opus 4.8
parent fb4b6b05fb
commit 5e161837d8
2 changed files with 4 additions and 4 deletions
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internal/design/spf/features/dvr-event-stream-support.md
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@@ -215,10 +215,10 @@ Things this feature probably forces decisions on, not just additions:
miss-counter), and the `setLiveSeekableRange` writer-behavior
shape. DVR/event-stream supplies the windowing variance and the
variant-specific seekable-range start producer. Its live-window
playhead guard's DVR `repositionPolicy` (preserve in-window
playhead guard's window-exit behavior (preserve in-window
scrub-back on the sliding window) is the analog of this feature's
full-history back-seek; the guard's edge-only `repositionPolicy`
variant is the no-scrub-back opposite end of that spectrum.
full-history back-seek; the edge-only end of that spectrum — no
scrub-back — is the `[live-edge-only-mode]` use-case.
- **[ll-hls-support](./ll-hls-support.md)** — orthogonal cluster A
extension. DVR + LL-HLS compose; both extensions sit atop the
same reload-loop foundation but address different concerns
internal/design/spf/use-cases/README.md
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@@ -141,7 +141,7 @@ Initially empty; populated as docs land. Candidates flagged in source material (
- [`audio-only-mode-override`](./audio-only-mode-override.md) *(partial — Phase 1 landed)* — audio-only delivery. Covers both truly-audio-only HLS sources and mixed-manifest sources delivered as audio-only via the same shared engine factory (`createHlsAudioOnlyEngine`). Subsumes what Notion originally framed as separate epics #4a (Basic Audio-only) and #4b (Audio-only Mode Override).
- [`video-only-mode-override`](./video-only-mode-override.md) *(coarse)* — video-only delivery. Inverse-axis sibling of [`audio-only-mode-override`](./audio-only-mode-override.md); same shape. Subsumes Notion epics NEW-A (Basic Video-only) and NEW-B (Video-only Composition).
- `[background-video]` — Mux's background-video product scenario: loop + autoplay-muted + GPU/thermal-aware caps + likely silent-video delivery. **Distinct from `video-only-mode-override`** despite shared Mux consumer context; both may share constituent features but address different delivery scenarios. *[GitHub #873](https://github.com/videojs/v10/issues/873); [`mux-background-video`](https://github.com/muxinc/mux-background-video) prior art.*
- `[live-edge-only-mode]` — pure-live delivery with no DVR scrub-back: always snap the playhead to the live edge on resume rather than preserving in-window position, optionally stop fetching segments while paused, and narrow the declared seekable range to the edge. The opposite end of the seekable spectrum from [`dvr-event-stream-support`](../features/dvr-event-stream-support.md). Composes on [`live-stream-support`](../features/live-stream-support.md) via its `repositionPolicy: 'on-resume'` seam (alternative-default-config) + a pause-fetch-gate behavior (add) + a narrowed-seekable producer (alternative-impl). Scope it only when a concrete consumer asks for edge-only.
- `[live-edge-only-mode]` — pure-live delivery with no DVR scrub-back: always snap the playhead to the live edge on resume rather than preserving in-window position, optionally stop fetching segments while paused, and narrow the declared seekable range to the edge. The opposite end of the seekable spectrum from [`dvr-event-stream-support`](../features/dvr-event-stream-support.md). Composes on [`live-stream-support`](../features/live-stream-support.md) by supplying its own snap-to-edge-on-resume reposition behavior in place of the window-exit guard (alternative-impl) + a pause-fetch-gate behavior (add) + a narrowed-seekable producer (alternative-impl). Scope it only when a concrete consumer asks for edge-only.
- Further candidates surfaced in source material but not yet scoped: picture-in-picture, short-form / shorts-player, audio-podcast mode, cast/remote-display compositions, ambient/decorative video.
## See also