$ streamlink -l debug 'https://video.ibm.com/nasahdtv' best
[cli][debug] OS:         Linux-5.15.5-2-git-x86_64-with-glibc2.33
[cli][debug] Python:     3.9.9
[cli][debug] Streamlink: 3.0.3+5.g5eb2ff6
[cli][debug] Requests(2.26.0), Socks(1.7.1), Websocket(1.2.1)
[cli][debug] Arguments:
[cli][debug]  url=https://video.ibm.com/nasahdtv
[cli][debug]  stream=['best']
[cli][debug]  --loglevel=debug
[cli][debug]  --player=mpv
[cli][info] Found matching plugin ustreamtv for URL https://video.ibm.com/nasahdtv
[plugins.ustreamtv][debug] Connecting to UStream API: media_id=6540154, application=channel, referrer=https://video.ibm.com/nasahdtv, cluster=live
[plugin.api.websocket][debug] Connecting to: wss://r4225582-1-6540154-channel-ws-live.ums.services.video.ibm.com/1/ustream
[plugins.ustreamtv][debug] Waiting for stream data (for at most 15 seconds)...
[plugins.ustreamtv][debug] Processing 'moduleInfo' - 'cdnConfig'
[plugins.ustreamtv][debug] Processing 'moduleInfo' - 'stream'
[cli][info] Available streams: 252p+a95k (worst), 252p+a137k, 360p+a95k, 360p+a137k, 486p+a95k, 486p+a137k, 720p+a95k, 720p+a137k (best)
[cli][info] Opening stream: 720p+a137k (muxed-stream)