A full pass that ran out of time kept what it reached, but its retry an hour
later started again at 0, so a file too big to read inside the extraction
timeout never completed. The pass now starts where every embedded track's
coverage from the head ends (less the window pre-roll, so a cue across the
join is read whole). The seek needs -avoid_negative_ts on this read as on a
window, measured on a real file: without it the cue running at the start
shifts the whole output.
A partial track whose full pass had failed never reached a settled state, so
the player polled it every 2 s for the rest of the film. The status now says
whether the track is still growing, and a stalled one is polled every 15 s —
still inside the 60 s lookahead that reads the next window before an edge.
peter
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