Restricted-Browser Video Diagnostics

Genuine prerecorded local video · frame-level telemetry · no DevTools required
Press RUN ALL TESTS, or run individual tiles. Watch the SUMMARY below.
Do your EYES see the videos MOVING, or frozen on one frame? Auto-PASS only means the browser decoded + fired frame-callbacks — it can't see your screen.  ·  For a clearer 1-video test with a FULLSCREEN check: open /focus →

SUMMARY MATRIX — photograph this after RUN ALL

Frame telemetry: —

PASS moving video · FREEZE audio/time advance, picture stuck · PARTIAL some frames · FAIL hard error / no timeline · UNKNOWN not run

Tests

Each tile: big PASS/FREEZE verdict, live telemetry (≥5×/sec), frame metrics (getVideoPlaybackQuality + requestVideoFrameCallback), a media-event log, and a plain-language interpretation mapped to CASE 1–5. ★ = highest-signal tests.

Server request log — live, from this local server