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fix(client/android): a decoder fed nothing it can decode must ask for a new anchor
An Android TV box reported a black screen with a perfectly healthy HUD: AUs
arriving at 40 fps, ~312 bytes each. That size is all-P-frames — no IDR anywhere
in the window, and nothing asking for one. The stats being readable is the rest
of the story: the overlay is a layer over the SurfaceView in the same window, so
the panel was fine and the surface simply never received a frame.

The decode thread only starts at `surfaceCreated`, so a slow box can be handed
the stream mid-GOP. A hardware decoder does not error on references it never
had; it emits nothing at all. Under infinite GOP the host sends no further IDR
unless asked, and neither Android loop ever asked: every recovery trigger they
have keys off a drop, a gap or a decode error, and a decoder that quietly
produces nothing trips none of them. The session stayed black for its whole life.

The shared gate has this case (`on_no_output`, which pf-client-core and the Apple
client both feed) but its per-AU streak counts one-in/one-out decodes, and
MediaCodec is pipelined — "this AU produced no output" is not something these
loops can observe. A wall-clock silence window is the same signal in the shape
Android can measure: fed for 500 ms with nothing coming back arms the freeze and
requests a re-anchor keyframe, and the gate's deadline keeps re-asking until one
lands. 500 ms so it can never fire on a decoder that is merely slow to spin up.

Also log the first presented frame. The periodic tally starts at 300 rendered
frames, which is no help whatsoever on a session that renders none — its absence
is what separates "never reached glass" from "reached glass and looked wrong".

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-07-29 17:57:13 +02:00
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