{
  "protocol_version": 3,
  "playback_attempt_id": "attempt-golden-0001",
  "session_id": "11111111-1111-4111-8111-111111111111",
  "plan_id": "plan:478677870860e5e5108c18bff749b34b",
  "plan_attempt_id": "plan-attempt-golden-0001",
  "plan_attempt_key": "v3:f0144c47fa349e3e",
  "event": "first_frame",
  "output_context_id": "7",
  "diagnostics": {
    "decoder_name": "c2.android.avc.decoder",
    "first_frame_ms": "412",
    "video_mime": "video/avc"
  }
}