Output file does not contain any stream - ffmpeg exit 1
**Describe the bug**

When using Homebridge and this plugin with two Yi Camera Outdoor with yihack5 firmware, at start they work in the UI and HomeKit, after some (random) time they just stop responding and when I open logs I see this:

**[6/14/2021, 5:11:37 PM] [CameraUI] [Plugin] Yicam1: Starting video stream: nativexnative, native fps, ??? kbps
[6/14/2021, 5:11:47 PM] [CameraUI] [Plugin] Yicam1: [error] Output file #0 does not contain any stream
[6/14/2021, 5:11:47 PM] [CameraUI] [Plugin] Yicam1: ffmpeg exited with code: 1 and signal: null (Error)
[6/14/2021, 5:11:47 PM] [CameraUI] [Plugin] Yicam1: Stopped video stream.**

**Logs**

`[6/14/2021,` 5:11:37 PM] [CameraUI] [Plugin] Yicam1: Starting video stream: nativexnative, native fps, ??? kbps
[6/14/2021, 5:11:47 PM] [CameraUI] [Plugin] Yicam1: [error] Output file #0 does not contain any stream
[6/14/2021, 5:11:47 PM] [CameraUI] [Plugin] Yicam1: ffmpeg exited with code: 1 and signal: null (Error)
[6/14/2021, 5:11:47 PM] [CameraUI] [Plugin] Yicam1: Stopped video `stream.`

Config.json camera related:

```
{
            "name": "CameraUI",
            "port": 8082,
            "atHomeSwitch": true,
            "theme": "auto",
            "language": "en",
            "debug": false,
            "mqtt": {
                "active": false
            },
            "http": {
                "active": false,
                "localhttp": false
            },
            "ssl": {
                "active": false
            },
            "cameras": [
                {
                    "name": "Yicam1",
                    "unbridge": true,
                    "videoConfig": {
                        "source": "-rtsp_transport tcp -re -i rtsp://user:pass@192.168.2.65/ch0_0.h264",
                        "stillImageSource": "http://192.168.2.65:8080/cgi-bin/snapshot.sh?res=high&watermark=yes",
                        "vcodec": "copy",
                        "audio": false,
                        "debug": true
                    }
                },
                {
                    "name": "Yicam2",
                    "unbridge": true,
                    "videoConfig": {
                        "source": "-rtsp_transport tcp -re -i rtsp://user:pass@192.168.2.14/ch0_0.h264",
                        "stillImageSource": "-i http://192.168.2.14:8080/cgi-bin/snapshot.sh?res=high&watermark=yes",
                        "vcodec": "copy",
                        "debug": true
                    }
                }
            ],
            "platform": "CameraUI"
        }
```

I tried copy as vcodec but also others, still problem. Can you give me an advice?

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Environment**
- Homebridge Version: latest
- Camera UI Version: latest
- Operating System: Synology DSM 6, using homebridge within docker container