AG-216: hardware decoders stop working until reboot — all cells receive, none decodes #145

Seen on Aceline-1 (AG-216, Android 10) on 2026-10-13 after a long test session (many APK installs, app restarts, a Majestic restart on a camera, an app killed by Back while in multi-view).

Symptom: every multi-view cell receives frames (in_fps 5–30) but none decodes (out_fps 0, corner … key frames · 0.0 fps). Only the first two decoders log Start video decoder; their decode threads then block and the queue overflows (Quad-0 queue full, NAL dropped). The other cells never get a decoder.

Not the app build: force-stop + relaunch, the newest build and an older build that had worked 20 minutes earlier all behave the same. A device reboot fixes it at once (same APK).

So the platform's decoder service is stuck. Ideas:

• detect it: no cell decoded anything for N s although all receive → say so in the corner / on the debug page ("Video decoder of the device not responding — restart the device") instead of 0.0 fps;
• find out what leaves it stuck (a codec not released when the process dies mid-configure?) and how to reproduce it.