diff --git a/README.md b/README.md
index d6e2e47..e871805 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,151 @@ http://<host>:8444/api/cameras               Kamera-Metadaten (JSON)
 http://<host>:8444/health                    Status
 ```
 
+## API-Referenz
+
+Basis-URL: `http://<host>:8444`
+
+---
+
+### `GET /api/cameras`
+
+Vollständige Kamera-Metadaten. Primärer Einstiegspunkt für andere Container.
+
+```json
+{
+  "cameras": [
+    {
+      "id":             "cam0",
+      "name":           "Kamera 0",
+      "position":       "front",
+      "stream":         true,
+      "hires":          true,
+      "encode":         "copybsf",
+      "mseCodec":       null,
+      "note":           "usb-046d_0825_3BB3FE20-video-index0",
+      "calibrationUrl": "/api/cameras/cam0/calibration"
+    }
+  ]
+}
+```
+
+`calibrationUrl` fehlt, wenn keine `.npz` unter `data/calibration/{id}/` liegt.  
+`encode`: `"copybsf"` (MJPEG-Copy, Default) | `"mjpeg"` (Re-Encode) | `"h264"` (GPU, MSE).  
+`mseCodec`: nur bei `encode="h264"` gesetzt, z.B. `"avc1.4D001F"`.
+
+---
+
+### `GET /api/cameras/{id}/calibration`
+
+Liefert die `.npz`-Kalibrierungsdatei (Kameramatrix + Verzerrungskoeffizienten) als Binary.
+
+```
+Content-Type:        application/octet-stream
+Content-Disposition: attachment; filename="cam0_calibration.npz"
+Cache-Control:       public, max-age=86400
+```
+
+404 wenn keine Kalibrierung vorhanden. Einlesen in Python:
+
+```python
+import numpy as np, requests
+d = np.load(requests.get(".../api/cameras/cam0/calibration", stream=True).raw)
+K, D = d["camera_matrix"], d["dist_coeffs"]
+```
+
+---
+
+### `GET /api/snapshot/{id}`
+
+Letztes Live-JPEG (Live-Auflösung, z.B. 640×480) aus dem RAM-Puffer.  
+Bei `stream: false`: one-shot — öffnet Gerät kurz, schließt es wieder.
+
+```
+Content-Type:    image/jpeg
+X-Camera-Id:     cam0
+X-Frame-Width:   640
+X-Timestamp:     2026-06-10T07:30:00.000Z
+Cache-Control:   no-store
+```
+
+503 wenn kein Frame verfügbar (Kamera nicht erreichbar).
+
+---
+
+### `GET /api/snapshot/{id}/hires`
+
+HD-JPEG (volle Auflösung, z.B. 1280×960 oder 1920×1080).  
+Pausiert den Live-Stream kurz, nimmt ein Einzelbild auf, startet Live neu.  
+Gleiche Response-Headers wie `/api/snapshot/{id}`.
+
+---
+
+### `GET /api/stream/{id}`
+
+Live-Stream. Format hängt vom `encode`-Modus ab:
+
+| encode | Content-Type | Player |
+|---|---|---|
+| `copybsf` / `mjpeg` | `multipart/x-mixed-replace; boundary=frame` | `<img src="...">` |
+| `h264` | `video/mp4` (fragmentiertes MP4) | `<video>` via MSE |
+
+Verbindung läuft bis der Client trennt. Langsame Clients droppen Frames (MJPEG)
+bzw. werden getrennt (H.264, um Decode-Lücken zu vermeiden).
+
+---
+
+### `GET /api/config`
+
+Laufzeit-Konfiguration aller Kameras.
+
+```json
+{
+  "liveSizes": ["320x240", "640x480", "1280x960"],
+  "encodes":   ["copybsf", "mjpeg", "h264"],
+  "cameras": [
+    {
+      "id":       "cam0",
+      "name":     "Kamera 0",
+      "liveSize": "640x480",
+      "stream":   true,
+      "encode":   "copybsf"
+    }
+  ]
+}
+```
+
+---
+
+### `POST /api/config`
+
+Ändert Auflösung, Stream-Zustand oder Encoder einer oder mehrerer Kameras.  
+Änderungen werden in `cameras.json` gespeichert und sofort aktiv (Hot-Reload).
+
+```json
+// Request Body
+{ "cameras": [{ "id": "cam0", "liveSize": "320x240", "stream": true, "encode": "copybsf" }] }
+```
+
+Alle Felder ausser `id` sind optional. Antwort: wie `GET /api/config`.  
+400 bei ungültiger Auflösung, unbekannter Kamera-ID oder falschem Typ.
+
+---
+
+### `GET /health`
+
+```json
+{
+  "status": "ok",
+  "cameras": [
+    { "id": "cam0", "name": "Kamera 0", "device": "/dev/video0", "state": "running", "hasFrame": true }
+  ]
+}
+```
+
+`state`: `"running"` | `"idle"` | `"stopping"` — Zustand des FFmpeg-Prozesses.
+
+---
+
 ## Deploy (Portainer)
 
 1. Portainer → Stacks → Web editor → `docker-compose.yaml` einfügen
diff --git a/cameras.json b/cameras.json
index 8c7ffbe..31de698 100644
--- a/cameras.json
+++ b/cameras.json
@@ -1,37 +1,40 @@
 {
   "cameras": [
     {
-      "id":       "cam0",
-      "device":   "/dev/video0",
-      "name":     "Kamera 0",
-      "position": "front",
-      "stream":   true,
-      "hires":    true,
-      "note":     "usb-046d_0825_3BB3FE20-video-index0",
-      "hiresSize": "1280x960",
-      "liveSize": "320x240"
+      "id":              "cam0",
+      "device":          "/dev/video0",
+      "name":            "Kamera 0",
+      "position":        "front",
+      "stream":          true,
+      "hires":           true,
+      "note":            "usb-046d_0825_3BB3FE20-video-index0",
+      "hiresSize":       "1280x960",
+      "liveSize":        "320x240",
+      "calibrationFile": "data/calibration/cam0/calibration.npz"
     },
     {
-      "id":       "cam1",
-      "device":   "/dev/video2",
-      "name":     "Kamera 1",
-      "position": "left",
-      "stream":   true,
-      "hires":    true,
-      "note":     "usb-046d_081b_342D4F40-video-index0",
-      "hiresSize": "1280x960",
-      "liveSize": "320x240"
+      "id":              "cam1",
+      "device":          "/dev/video2",
+      "name":            "Kamera 1",
+      "position":        "left",
+      "stream":          true,
+      "hires":           true,
+      "note":            "usb-046d_081b_342D4F40-video-index0",
+      "hiresSize":       "1280x960",
+      "liveSize":        "320x240",
+      "calibrationFile": "data/calibration/cam1/calibration.npz"
     },
     {
-      "id":       "cam2",
-      "device":   "/dev/video4",
-      "name":     "Kamera 2",
-      "position": "right",
-      "stream":   true,
-      "hires":    true,
-      "note":     "usb-046d_HD_Pro_Webcam_C920_9C5591DF-video-index0",
-      "hiresSize":  "1920x1080",
-      "liveSize": "320x240"
+      "id":              "cam2",
+      "device":          "/dev/video4",
+      "name":            "Kamera 2",
+      "position":        "right",
+      "stream":          true,
+      "hires":           true,
+      "note":            "usb-046d_HD_Pro_Webcam_C920_9C5591DF-video-index0",
+      "hiresSize":       "1920x1080",
+      "liveSize":        "320x240",
+      "calibrationFile": "data/calibration/cam2/calibration.npz"
     }
   ]
 }
diff --git a/server.js b/server.js
index 8725381..ce802c8 100644
--- a/server.js
+++ b/server.js
@@ -41,7 +41,9 @@ const MSE_CODEC = process.env.H264_MSE_CODEC ?? mseCodecString(H264.profile, pro
 function loadCalibrations(camsConfig) {
   const calib = {};
   for (const cam of camsConfig) {
-    const p = path.join(__dirname, 'data', 'calibration', cam.id, 'calibration.npz');
+    const p = cam.calibrationFile
+      ? path.resolve(__dirname, cam.calibrationFile)
+      : path.join(__dirname, 'data', 'calibration', cam.id, 'calibration.npz');
     if (fs.existsSync(p)) {
       calib[cam.id] = fs.readFileSync(p);
       console.log(`  Kalibrierung:   ${cam.id} (${calib[cam.id].length} Bytes)`);