[Camera FFmpeg] [Keller] FFmpeg process creation failed: spawn ffmpeg ENOENT
<!-- You must use the issue template below -->

**Describe The Problem:**
<After a new installation of Hombrigde I wan`t be able access the camera with Apple Home I see no picture. -->

**To Reproduce:**
<Restart, and Reinstallation of plugin was not successfull>

**Logs:**
<!-- Bug reports that do not contain logs may be closed without warning. -->

```
Loading logs using native method...
File: /var/lib/homebridge/homebridge.log


[11/2/2023, 5:24:43 PM] [Camera FFmpeg] [Keller] FFmpeg process creation failed: spawn ffmpeg ENOENT
[11/2/2023, 5:24:43 PM] [Camera FFmpeg] [Keller] Stopped video stream.
[11/2/2023, 5:24:44 PM] [DysonPureCoolPlatform] NN2-EU-NEB5375A - MQTT disconnected.
[11/2/2023, 5:24:45 PM] [DysonPureCoolPlatform] NN2-EU-NEB5375A - MQTT reconnecting.
[11/2/2023, 5:24:46 PM] [Camera FFmpeg] [Keller] Snapshot requested: 1280 x 720
[11/2/2023, 5:24:46 PM] [Camera FFmpeg] [Keller] Snapshot command: ffmpeg -re -i rtsps://192.168.20.10:7441/Xdrm6OwSkHakuArm?enableSrtp -frames:v 1 -f image2 - -hide_banner -loglevel error
[11/2/2023, 5:24:46 PM] [Camera FFmpeg] [Keller] FFmpeg process creation failed: spawn ffmpeg ENOENT
[Keller] Snapshot request handler provided empty image buffer!
[11/2/2023, 5:24:46 PM] [Camera FFmpeg] [Keller] Fetching snapshot took 0.01 seconds.

```

**Homebridge Config:**

```json

    "bridge": {
        "port": 51321,
        "name": "Homebridge 6EAD",
        "pin": "604-69-236",
        "username": "0E:AA:38:6E:6E:AD",
        "bind": [
            "eth0"
        ]
    },
    "disabledPlugins": [
        "homebridge-vsx-2",
        "homebridge-kodi"
    ],
    "platforms": [
        {
            "sessionTimeout": 86400000,
            "theme": "auto",
            "port": 8581,
            "name": "Config",
            "auth": "form",
            "lang": "auto",
            "tempUnits": "c",
            "platform": "config"
        },
{
    "name": "Camera FFmpeg",
    "cameras": [
        {
            "name": "Eingang",
            "manufacturer": "Axis",
            "model": "M-2025LE",
            "serialNumber": "1234",
            "unbridge": false,
            "videoConfig": {
                "source": "rtsp://root:Cottleid70@192.168.20.40:554/axis-media/media.amp?videocodec=h264&streamprofile=Quality",
                "stillImageSource": "rtsp://root:Cottleid70@192.168.20.40:554/axis-media/media.amp?videocodec=h264&streamprofile=Quality"
            }
        }
    ],
    "platform": "Camera-ffmpeg"
        {
          