Deep-review round 4, the Plex player.
- A 404 on an HLS session that WAS playing means the server reaped it (a long pause, a deploy);
hls.js never retries a 4xx, so playback ended with "couldn't play". A new session at the playhead
now takes its place (the frontend half of the paused-viewer reap fix). A session that 404s before
its manifest is still a plain failure, so it cannot restart itself in a loop.
- Leaving an item that ended, or that the credits auto-skip left, sent a final checkpoint at the
credits (racing the watched mark, and pushing a resume point to Plex after the scrobble) and
patched "new, at 49:55" into the cache — Prev reopened it at its last seconds. `finish` settles it
as watched at 0, said before the pause whose own checkpoint could land first.
- An audio switch, an A/V offset change and every seek control read `abs`, which is 0 until
playback ticks: a resume at 20:00 restarted from 0:00. They use the shared `playhead`.
- A seek while a restart is pending always restarts (the old media's `seekable` described the old
session, and the pending answer overrode the newer seek).
- A superseded direct-play session's loadedmetadata/canplay are generation-gated and detached (they
seeked the next item to the previous one's resume point).
- The session starts once per item: a reconnect refetch, the info panel's watched toggle or a
language switch no longer restarts the film at the last checkpoint.
- Tests for the session generation's failure paths and the item-change bump, which had none.
peter
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