Cannot get livestream from Zoneminder
hi, amazing plugin, I am new to homebridge and this makes it easy to work with. 

I am just testing zone minder with home bridge for the first time and cannot get a live feed, only a still.

Below you can see the direct RTSP stream from the camera Dome works, but trying to get the stream from zoneminder fails.

I have installed the 5.0 beta 36 and still the same behaviour. Is there something in my config to change?

Thanks

```
  {
            "name": "CameraUI",
            "port": 8181,
            "atHomeSwitch": false,
            "debug": true,
            "mqtt": {
                "active": true,
                "host": "192.168.1.62",
                "port": 1883
            },
            "http": {
                "active": false,
                "localhttp": false
            },
            "smtp": {
                "active": false
            },
            "ftp": {
                "active": false
            },
            "ssl": {
                "active": false
            },
            "options": {
                "videoProcessor": "ffmpeg"
            },
            "cameras": [
                {
                    "name": "Dome",
                    "manufacturer": "Yi",
                    "model": "Cloud Dome 1080p",
                    "motion": true,
                    "unbridge": true,
                    "videoConfig": {
                        "source": "-re -i rtsp://192.168.1.64/ch0_0.h264",
                        "stillImageSource": "-rtsp_transport tcp -re -i rtsp://192.168.1.64/ch0_0.h264",
                        "maxStreams": 10,
                        "vcodec": "copy",
                        "stimeout": 0,
                        "audio": false
                    },
                    "mqtt": {
                        "motionTopic": "yicam_dome_keller/motion",
                        "motionMessage": "ON",
                        "motionResetTopic": "yicam_dome_keller/motion",
                        "motionResetMessage": "OFF"
                    }
                },
                {
                    "name": "ZM",
                    "manufacturer": "ZM",
                    "motion": false,
                    "unbridge": true,
                    "videoConfig": {
                        "source": "-re -i http://192.168.1.32/zm/cgi-bin/nph-zms?mode=jpeg&monitor=3&scale=100&maxfps=30&buffer=1000&user=homebridge&pass=homebridge",
                        "stillImageSource": "-i http://192.168.1.32/zm/cgi-bin/nph-zms?mode=single&monitor=3&scale=100&user=homebridge&pass=homebridge",
                        "maxStreams": 10,
                        "maxWidth": 1920,
                        "maxHeight": 1080,
                        "maxFPS": 30,
                        "vcodec": "copy",
                        "stimeout": 0,
                        "audio": false
                    }
                }
            ],
            "platform": "CameraUI"
        },

```
```
[12/31/2021, 8:41:28 AM] Homebridge v1.3.9 (HAP v0.9.8) (Homebridge 219B) is running on port 51619.
[12/31/2021, 8:41:28 AM] [Plex Webhooks Platform] Server is listening at http://192.168.1.62:32401
[12/31/2021, 8:41:28 AM] [CameraUI] Dome: Setting up camera, please be patient...
[12/31/2021, 8:41:28 AM] [CameraUI] Dome: Probe stream: ffmpeg -i rtsp://192.168.1.64/ch0_0.h264
[12/31/2021, 8:41:28 AM] [CameraUI] ZM: Setting up camera, please be patient...
[12/31/2021, 8:41:28 AM] [CameraUI] ZM: Probe stream: ffmpeg -i http://192.168.1.32/zm/cgi-bin/nph-zms?mode=jpeg&monitor=3&scale=100&maxfps=30&buffer=1000&user=homebridge&pass=homebridge
[12/31/2021, 8:41:28 AM] [CameraUI] ZM: {"probe":true,"timedout":false,"audio":[],"video":["mjpeg (Baseline)","yuvj420p(pc","bt470bg/unknown/unknown)","1920x1080 [SAR 1:1 DAR 16:9]","25 tbr","25 tbn","25 tbc"]}
[12/31/2021, 8:41:30 AM] [CameraUI] Dome: {"probe":true,"timedout":false,"audio":[],"video":["h264 (High)","yuvj420p(pc","bt709","progressive)","1920x1080","20 fps","20 tbr","90k tbn","180k tbc"]}
[12/31/2021, 8:41:30 AM] [CameraUI] Setting up MQTT client for motion detection...
[12/31/2021, 8:41:30 AM] [CameraUI] Dome: Configuring unbridged accessory...
[12/31/2021, 8:41:30 AM] [CameraUI] Dome: Setting up accessory...
[12/31/2021, 8:41:30 AM] [CameraUI] Dome: Adding motion sensor service
[12/31/2021, 8:41:30 AM] [CameraUI] ZM: Configuring unbridged accessory...
[12/31/2021, 8:41:30 AM] [CameraUI] ZM: Setting up accessory...
[12/31/2021, 8:41:30 AM] [CameraUI] camera.ui v5.0.0-beta.36 is listening on port 8181 (http)
[12/31/2021, 8:41:30 AM] Dome 5FBD is running on port 39427.
[12/31/2021, 8:41:30 AM] Please add [Dome 5FBD] manually in Home app. Setup Code: 442-89-084
[12/31/2021, 8:41:30 AM] ZM 1C94 is running on port 36341.
[12/31/2021, 8:41:30 AM] Please add [ZM 1C94] manually in Home app. Setup Code: 442-89-084
[12/31/2021, 8:41:38 AM] [CameraUI] ZM: Snapshot requested: 1280 x 720
[12/31/2021, 8:41:38 AM] [CameraUI] ZM: Snapshot command: ffmpeg -hide_banner -loglevel error -i http://192.168.1.32/zm/cgi-bin/nph-zms?mode=single&monitor=3&scale=100&user=homebridge&pass=homebridge -frames:v 1 -f image2 -
[12/31/2021, 8:41:38 AM] [CameraUI] ZM: Fetching snapshot took 0.088 seconds.
[12/31/2021, 8:41:38 AM] [CameraUI] ZM: Sending snapshot: 1280x720
[12/31/2021, 8:41:38 AM] [CameraUI] ZM: Resize command: ffmpeg -i pipe: -frames:v 1 -filter:v scale='min(1280,iw)':'min(720,ih)':force_original_aspect_ratio=decrease -f image2 -
[12/31/2021, 8:41:49 AM] [CameraUI] ZM: Snapshot requested: 1280 x 720
[12/31/2021, 8:41:49 AM] [CameraUI] ZM: Snapshot command: ffmpeg -hide_banner -loglevel error -i http://192.168.1.32/zm/cgi-bin/nph-zms?mode=single&monitor=3&scale=100&user=homebridge&pass=homebridge -frames:v 1 -f image2 -
[12/31/2021, 8:41:49 AM] [CameraUI] ZM: Fetching snapshot took 0.097 seconds.
[12/31/2021, 8:41:49 AM] [CameraUI] ZM: Sending snapshot: 1280x720
[12/31/2021, 8:41:49 AM] [CameraUI] ZM: Resize command: ffmpeg -i pipe: -frames:v 1 -filter:v scale='min(1280,iw)':'min(720,ih)':force_original_aspect_ratio=decrease -f image2 -
[12/31/2021, 8:41:59 AM] [CameraUI] ZM: Snapshot requested: 1280 x 720
[12/31/2021, 8:41:59 AM] [CameraUI] ZM: Snapshot command: ffmpeg -hide_banner -loglevel error -i http://192.168.1.32/zm/cgi-bin/nph-zms?mode=single&monitor=3&scale=100&user=homebridge&pass=homebridge -frames:v 1 -f image2 -
[12/31/2021, 8:41:59 AM] [CameraUI] ZM: Fetching snapshot took 0.097 seconds.
[12/31/2021, 8:41:59 AM] [CameraUI] ZM: Sending snapshot: 1280x720
[12/31/2021, 8:41:59 AM] [CameraUI] ZM: Resize command: ffmpeg -i pipe: -frames:v 1 -filter:v scale='min(1280,iw)':'min(720,ih)':force_original_aspect_ratio=decrease -f image2 -
[12/31/2021, 8:42:09 AM] [CameraUI] ZM: Snapshot requested: 1280 x 720
[12/31/2021, 8:42:09 AM] [CameraUI] ZM: Snapshot command: ffmpeg -hide_banner -loglevel error -i http://192.168.1.32/zm/cgi-bin/nph-zms?mode=single&monitor=3&scale=100&user=homebridge&pass=homebridge -frames:v 1 -f image2 -
[12/31/2021, 8:42:09 AM] [CameraUI] ZM: Fetching snapshot took 0.09 seconds.
[12/31/2021, 8:42:09 AM] [CameraUI] ZM: Sending snapshot: 1280x720
[12/31/2021, 8:42:09 AM] [CameraUI] ZM: Resize command: ffmpeg -i pipe: -frames:v 1 -filter:v scale='min(1280,iw)':'min(720,ih)':force_original_aspect_ratio=decrease -f image2 -
[12/31/2021, 8:42:16 AM] [Homebridge UI] [homebridge-camera-ui] Terminating child process...
[12/31/2021, 8:42:16 AM] [Homebridge UI] [homebridge-camera-ui] Child process ended
[12/31/2021, 8:42:19 AM] [CameraUI] ZM: Snapshot requested: 1280 x 720
[12/31/2021, 8:42:19 AM] [CameraUI] ZM: Snapshot command: ffmpeg -hide_banner -loglevel error -i http://192.168.1.32/zm/cgi-bin/nph-zms?mode=single&monitor=3&scale=100&user=homebridge&pass=homebridge -frames:v 1 -f image2 -
[12/31/2021, 8:42:19 AM] [CameraUI] ZM: Fetching snapshot took 0.097 seconds.
[12/31/2021, 8:42:19 AM] [CameraUI] ZM: Sending snapshot: 1280x720
[12/31/2021, 8:42:19 AM] [CameraUI] ZM: Resize command: ffmpeg -i pipe: -frames:v 1 -filter:v scale='min(1280,iw)':'min(720,ih)':force_original_aspect_ratio=decrease -f image2 -
[12/31/2021, 8:42:23 AM] [CameraUI] ZM: Video stream requested: 1280x720, 30 fps, 299 kbps
[12/31/2021, 8:42:23 AM] [CameraUI] ZM: Starting video stream: nativexnative, native fps, ??? kbps 
[12/31/2021, 8:42:23 AM] [CameraUI] ZM: Setting rebroadcast stream as input
[12/31/2021, 8:42:23 AM] [CameraUI] ZM: Can not access rebroadcast stream, skipping: Error: Prebuffer process not started!
[12/31/2021, 8:42:23 AM] [CameraUI] ZM: Incoming ping request for: http://192.168.1.32/zm/cgi-bin/nph-zms?mode=jpeg&monitor=3&scale=100&maxfps=30&buffer=1000&user=homebridge&pass=homebridge - Timeout: 1s
[12/31/2021, 8:42:23 AM] [CameraUI] ZM: Pinging http://192.168.1.32
[12/31/2021, 8:42:23 AM] [CameraUI] ZM: Pinging http://192.168.1.32 - successful
[12/31/2021, 8:42:23 AM] [CameraUI] ZM: Stream command: ffmpeg -hide_banner -loglevel level -re -i http://192.168.1.32/zm/cgi-bin/nph-zms?mode=jpeg&monitor=3&scale=100&maxfps=30&buffer=1000&user=homebridge&pass=homebridge -an -sn -dn -vcodec copy -pix_fmt yuv420p -color_range mpeg -f rawvideo -payload_type 99 -ssrc 14807064 -f rtp -srtp_out_suite AES_CM_128_HMAC_SHA1_80 -srtp_out_params ZINrHJnXXRUZxO5mFvkUsGyErgAmKv3kTyqQBGLz srtp://192.168.1.38:55766?rtcpport=55766&pkt_size=1316 -progress pipe:1
[12/31/2021, 8:42:23 AM] [CameraUI] ZM: Getting the first frames took 0.69 seconds.
```