Dahua NVR problem

![Screenshot 2021-03-24 at 23 30 08](https://user-images.githubusercontent.com/81358499/112455696-4179b380-8d5a-11eb-85a1-5ccfb4febc2e.jpg)
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**Describe The Problem:**

Cameras not working :( Its show this errors.
Thx for help.

<!-- A clear and concise description of what the bug is. -->

**To Reproduce:**
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**Logs:**
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```
Show the Homebridge logs here.
Remove any sensitive information.
```

**Homebridge Config:**

```json
{
    "bridge": {
        "name": "Homebridge FF23",
        "username": "MY:ID:0E:0E:0E:0E",
        "port": 53553,
        "pin": "031-45-154"
    },
    "accessories": [],
    "platforms": [
        {
            "name": "Config",
            "port": 8581,
            "platform": "config"
        },
        {
            "name": "Config",
            "cameras": [
                {
                    "name": "Garazs",
                    "videoConfig": {
                        "source": "-rtsp_transport tcp -re -i rtsp://admin:MY_PASSWORD@192.168.1.248:554/cam/realmonitor?channel=1&subtype=1",
                        "stillImageSource": "-i http://admin:MY_PASSWORD@192.168.1.248/cgi-bin/snapshot.cgi?chn=1",
                        "maxBitrate": 2048,
                        "vcodec": "libx264 -preset ultrafast"
                    }
                },
                {
                    "name": "Kaputelefon",
                    "doorbell": true,
                    "switches": true,
                    "videoConfig": {
                        "source": "-rtsp_transport tcp -re -i rtsp://admin:MY_PASSWORD@192.168.1.247:554/cam/realmonitor?channel=1&subtype=1",
                        "stillImageSource": "-i http://admin:MY_PASSWORD@192.168.1.247/cgi-bin/snapshot.cgi?chn=1",
                        "audio": true
                    }
                }
            ],
            "platform": "Camera-ffmpeg"
        }
    ]
}
```

**Screenshots:**
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**Environment:**

* **Node.js Version**: <!-- node -v -->
* **NPM Version**: <!-- npm -v -->
* **Homebridge Version 4.41.0: <!-- homebridge -V -->
* **Homebridge Camera FFmpeg Version 3.1.2:
* **Homebridge Config UI X Plugin Version**:
* **Operating System**: <!-- Raspbian / Ubuntu / Debian / Windows / macOS / Docker -->


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