{"service": "UIX Dahua Playback API", "session_policy": "one session per user", "idle_timeout_seconds": 1200, "start": "POST /playback/start", "status": "GET /playback/{session_id}", "touch": "POST /playback/{session_id}/touch", "stop": "DELETE /playback/{session_id}", "hls": "GET /sdk/hls/{session_id}/index.m3u8"}