The smoothed passthrough clock from aeb06c2c9 (edde746/mpv-build 0105)
still let the Shield in #2202 drop a frame every 70 s or so on TrueHD and
DTS-HD MA. The average handles head jitter completely - on a Shield with
the raw head artificially held for 150 ms it went from 410 dropped frames
in 200 s to 0 - but it regresses on stalls: when the head freezes (device
underrun, rebuffer, a HAL that stops updating) while the wall clock runs,
the estimate runs past what was written, (written - head) wraps, and
getLatency reports 0 - the core sees the whole device buffer vanish in one
step and drops video. With the AO starved for 400 ms every 15 s that was 77
drops in 170 s against 8 with the raw clock, and a Box R 4K Plus hit the
wrap 361 times in four minutes of ordinary DTS-HD playback.
Move the native pin to edde746/mpv-build@a58f0c1336: the estimate is
clamped to the written position and its window restarted on overshoot, and
between reports it may deviate from "last report + elapsed" by at most 10%
of the elapsed time unless it is a second or more off - the two guards
media3's AudioTrackPositionTracker keeps over the same average. Starvation
run: 9 drops, no wrap; real HAL with pauses and seeks: 0 drops. The pin also
carries verbose-level diagnostics for this issue (per-drop timing in vo.c,
passthrough clock anomalies and a 10 s summary in ao_audiotrack) so the
next log from the reporter pins whatever remains. Apple, Linux and Windows
assets are unchanged (their content keys did not move).
edde746
b61fc9e661