The RX-9070 field trace: 14 decode-recovery keyframe requests in 2 s at
~300 Mbps with loss_ppm=0 — and the controller held the rate, because no
loss/OWD/latency signal moved. Repeated keyframe asks ARE the decoder
saying it cannot keep up; now they are an ABR input.
The control task counts outbound CtrlRequest::Keyframe at its send choke
point (the one place every emitter funnels through); the pump drains the
count per 750 ms report window into on_window. Two asks in a window is
ordinary-bad (two-window confirmation, like an OWD rise); four or more is
severe (the emitters throttle at 100 ms, so 4+ means the window was spent
begging) and backs off ×0.7 after one window. RFI asks are deliberately
not counted — they are the routine loss-recovery path and loss_ppm
already prices them in.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehlerandClaude Fable 5
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