$ streamlink https://www.mixcloud.com/live/UrbanVybez best
[cli][info] Found matching plugin mixcloud for URL https://www.mixcloud.com/live/UrbanVybez
[cli][info] Available streams: 720p (worst, best)
[cli][info] Opening stream: 720p (hls)
[cli][info] Starting player: mpv
[cli][info] Player closed
[cli][info] Stream ended
[cli][info] Closing currently open stream...
$ streamlink -j 'https://www.mixcloud.com/live/EnjoyableRadio/' | jq .metadata
{
  "id": "VXNlcjo0NDc5MzA0MA==",
  "author": "Enjoyable Radio",
  "category": null,
  "title": "'80s REWIND LIVE with Kev, Matt, and Grace : Playing Hits of the Eighties"
}
$ streamlink https://www.mixcloud.com/live/BeachyHeadRadio/
[cli][info] Found matching plugin mixcloud for URL https://www.mixcloud.com/live/BeachyHeadRadio/
[plugins.mixcloud][info] This stream has ended
error: No playable streams found on this URL: https://www.mixcloud.com/live/BeachyHeadRadio/
$ streamlink https://www.mixcloud.com/live/not-a-user
[cli][info] Found matching plugin mixcloud for URL https://www.mixcloud.com/live/not-a-user
[plugins.mixcloud][error] User not found
error: No playable streams found on this URL: https://www.mixcloud.com/live/not-a-user