A session that lost its sink sat spinning forever: the watchdog measured media
time, which does not advance while the picture is frozen, so a stall could not be
told from an ordinary rebuffer and the recovery ladder was never climbed.
The stall is now judged in playout time against the load control's own view of
whether the buffer was ever enough. Readiness is the union of the three signals
rather than a precedence chain, because media3 stops asking its load control once
a renderer wedges - the very failure this watchdog exists to catch - and a stale
verdict could otherwise hold it shut. The watchdog is armed on every path that
replaces the source, including the same-state reloads that produce no state change
of their own, and a seek rebaselines it so a backward seek does not inherit the
old clock.
Handing over to MPV keeps the position playback reached rather than restarting the
episode, and a play or pause issued mid-handover is recorded on the queued open,
which is the only thing left to command while one core is being disposed and its
replacement does not yet exist.
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