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+## Dependencies
+
+- `ffmpeg`
+
+## HLS
+
+Let's assume IP cameras stream h264 via rtsp.
+
+- Create `/var/ipcamfs` directory.
+
+- Add to `/etc/fstab`:
+  ```
+  tmpfs /var/ipcamfs tmpfs mode=1755,uid=1000,gid=1000,size=350M 0 0
+  ```
+
+  You may want to adjust tmpfs size.
+
+- Run `mount /var/ipcamfs`.
+
+- Copy systemd unit file:
+  ```
+  cp /home/user/homekit/systemd/ipcam_rtsp2hls@.service /etc/systemd/system
+  ```
+
+- Create configuration directory:
+  ```
+  mkdir /etc/ipcam_rtsp2hls.conf.d
+  ```
+
+- Then for each `camname`:
+  - create `/etc/ipcam_rtsp2hls.conf.d/camname.conf` with following content:
+    ```
+    USER=suer
+    PASSWORD=password
+    IP=192.168.1.2
+    PORT=554
+    # uncomment if needed
+    # ARGS="--force-tcp"
+    ```
+  - run `systemctl enable ipcam_rtsp2hls@camname` and `systemctl start ipcam_rtsp2hls@camname`
+
+## Recording
+
+- Copy systemd unit file:
+
+  ```
+  cp /home/user/homekit/systemd/ipcam_capture@.service /etc/systemd/system
+  ```
+
+- Create configuration directory:
+  ```
+  mkdir /etc/ipcam_capture.conf.d
+  ```
+
+- Then for each `camname`:
+  - create `/etc/ipcam_capture.conf.d/camname.conf` with following content:
+    ```
+    IP=192.168.1.2
+    PORT=554
+    CREDS="user:password"
+    OUTDIR=/path/to/files
+    # uncomment if needed
+    # ARGS="--force-tcp"
+    ```
+  - run `systemctl enable ipcam_capture@camname` and `systemctl start ipcam_capture@camname`