forked from unom/punktfunk
enricobuehlerandClaude Opus 5
e44baf6768
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>