The BD-J VM progresses only on reads. With playback at EOF or on a
held still nothing reads anymore, applet playlist switches never
surface and menus freeze, libbluray documents this polling requirement
for idle states. Drive one nav read per tick and keep the core awake.
The slave demuxer latches its EOF and stops touching the stream, so
the read path peeks the stream itself to run its event loop. Poll the
same way while paused in a menu, highlight redraws would otherwise
wait for the next core wakeup. dvdnav stills release on user input,
not reads, and the pump bypasses the cache limits, so no pumping
outside these states.
Kacper Michajłow
79186bd167