Error when select camera in Homebridge UI X
```
[5/7/2021, 7:39:37 AM] [Homebridge UI] [homebridge-camera-ui] events.js:292
      throw er; // Unhandled 'error' event
      ^

Error: spawn ffmpeg ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:269:19)
    at onErrorNT (internal/child_process.js:465:16)
    at processTicksAndRejections (internal/process/task_queues.js:80:21)
Emitted 'error' event on ChildProcess instance at:
    at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12)
    at onErrorNT (internal/child_process.js:465:16)
    at processTicksAndRejections (internal/process/task_queues.js:80:21) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'spawn ffmpeg',
  path: 'ffmpeg',
  spawnargs: [
    '-rtsp_transport',
    'tcp',
    '-re',
    '-i',
    'rtsp://192.168.1.153:554/live/ch0',
    '-f',
    'mpegts',
    '-codec:v',
    'mpeg1video',
    '-s',
    '1280x720',
    '-b:v',
    '299k',
    '-r',
    20,
    '-bf',
    0,
    '-preset:v',
    'ultrafast',
    '-threads',
    '1',
    '-loglevel',
    'quiet',
    '-codec:a',
    'mp2',
    '-ar',
    '44100',
    '-ac',
    '1',
    '-b:a',
    '128k',
    '-'
  ]
}
```