ffmpeg EACCES error
**Describe The Bug:**
Snapshot or video stream fails.

**To Reproduce:**
Every time I open the camera in Home app

**Expected behavior:**
Snapshots should show in the app and video stream in the app when opening the camera.

**Logs:**

```
[6/24/2020, 9:08:27 PM] [Security Cameras] Snapshot from Driveway at 480:270
[6/24/2020, 9:08:27 PM] [Security Cameras] An error occurred while making snapshot request
[6/24/2020, 9:08:35 PM] [Security Cameras] [FFMPEG] Failed to start stream: spawn /homebridge/node_modules/homebridge-camera-ffmpeg/node_modules/ffmpeg-for-homebridge/ffmpeg EACCES
```

**Homebridge Config:**

```json
{
    "bridge": {
        "name": "Homebridge 9347",
        "username": "0E:BC:CB:CA:93:48",
        "port": 53253,
        "pin": "031-45-154"
    },
    "platforms": [
        {
            "name": "Security Cameras",
            "cameras": [
                {
                    "name": "Driveway",
                    "manufacturer": "Reolink",
                    "model": "RLC-410-5MP",
                    "firmwareRevision": "v2.0.0.448_19061407",
                    "videoConfig": {
                        "source": "-rtsp_transport tcp -re -i rtsp://motion:motioneye@192.168.1.59:554/h264Preview_01_sub",
                        "stillImageSource": "-i http://192.168.1.59/cgi-bin/api.cgi?cmd=Snap&channel=0&rs=&user=motion&password=motioneye",
                        "maxStreams": 2,
                        "maxFPS": 15,
                        "maxBitrate": 300,
                        "vcodec": "copy",
                        "videoFilter": "none",
                        "audio": false,
                        "debug": false
                    }
                }
            ],
            "platform": "Camera-ffmpeg"
        }
    ],
    "accessories": []
}
```

**Screenshots:**
n/a

**Environment:**

* **Node.js Version**: v12.18.1
* **NPM Version**: v6.14.5
* **Homebridge Version**: 1.1.1
* **Homebridge Camera FFmpeg Version**: 2.0.0
* **Homebridge Config UI X Plugin Version**: 4.23.0
* **Operating System**: Docker on Raspberry Pi 4
