Streaming not working via homebridge, but can connect with VLC
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I'm not sure if this is related to #584 or #554, but I am running 2.3.0 and seeing these issues.

**Describe The Bug:**
<!-- A clear and concise description of what the bug is. -->
Snapshots work fine, but when I open a camera to see the video stream in HomeKit, it eventually times out and I see these in the homebridge logs:

```
homebridge[1032711]: [7/16/2020, 12:44:20 AM] [Camera-ffmpeg] Starting Front Door video stream (1280x720, 23 fps, 299 kbps, 1316 mtu)...
homebridge[1032711]: [7/16/2020, 12:44:20 AM] [Camera-ffmpeg] FFMPEG: received first frame
homebridge[1032711]: [7/16/2020, 12:44:50 AM] [Camera-ffmpeg] Stopped Front Door video stream!
homebridge[1032711]: [7/16/2020, 12:44:50 AM] [Camera-ffmpeg] [FFMPEG] ffmpeg exited with code: null and signal: SIGKILL (FFMPEG Stream stopped!)
```

I can successfully connect to the RTSP stream with VLC using the same URL as in my homebridge config.

I have two Foscam C1 cameras and I am able to reproduce this with both of them.

**Homebridge Config:**

```json
{
    "platform": "Camera-ffmpeg",
    "cameras": [
    {
        "name": "Front Door",
        "motion": true,
        "debug": true,
        "videoConfig": {
        "source": "-re -i rtsp://username:password@10.0.0.220:554/videoMain",
        "stillImageSource": "-i http://10.0.0.220:88//cgi-bin/CGIProxy.fcgi?cmd=snapPicture2&amp;usr=username&amp;pwd=password",
        "maxStreams": 2,
        "maxWidth": 1280,
        "maxHeight": 720,
        "maxFPS": 23
    }
}
```

**Environment:**

* **Node.js Version**: v12.18.2
* **NPM Version**: 6.14.6
* **Homebridge Version**: 1.1.1
* **Homebridge Camera FFmpeg Version**: 2.3.0
* **Operating System**: Debian 11


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