A skip back of 10-20 s on a freshly tuned Plex Live TV channel landed on
or after the frame being shown, while the same skip worked once the viewer
had already time-shifted. Offset-less opens (initial tune, retry, channel
zap, subtitle switch at the edge) pinned stream position zero to wall clock
at open time, but the transcode starts behind real time by tuner ingest and
encoder start-up latency; offset opens were exact because the server
defines their origin.
Every /:/timeline response already carries the playback transcode as the
top-level TranscodeSession next to the CaptureBuffer wrapper; its timeStamp
is the epoch of stream position zero, which Plex's own client uses as the
playhead origin. The parser used to return only the capture window. It now
returns both, and each heartbeat re-anchors the clock on the playback
origin unless the response predates the current open or an open is still
calibrating. Offset-less opens seed a provisional anchor from the capture
edge instead of wall clock, and the live-edge threshold is widened to 15 s
so a live stream trailing the edge by normal latency still reads as live.
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