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• id - subscriber identifier
• ip - subscriber IP address
• port -  subscriber source port
• userAgent - User-Agent header sent by subscriber
• active - subscriber is active
• metrics - current subscriber metrics:
  • profileTime - the time the subscriber requested the profile shown by profile
  • requestsNumber - subscribers requests number
  • requestStatuses - response status codes count sent to the subscriber shown by response status code
  • profileSwitches - HLS ABR profile switches count for the subscriber
  • maxResponseTime - maximum response time
  • minResponseTime - minimum response time
  • avgResponseTime - average response time

HLS subscribers and connections displaying issues

In the response to the /hls/find_all, /hls/profiles, /hls/subscribers  queries a current HLS subscribers count and information are returned as per browser tabs. But HLS network connections count displaying at WCS statistics page

curl -s http://localhost:8081/?action=stat&params=connections_hls

may differ from HLS subscribers count. In the most cases, HLS subscribers use HTTP 2 protocol to connect and download a segments, then all the browser tabs receiving HLS streams from the same WCS server will use the same network connection.

In this case connections count displayed by connections_hls parameter is usually equal to HLS port connections count displayed by netstat command:

sudo netstat -np | grep ESTABLISHED | grep java | grep 8445

Where 8445 is HTTPS HLS port of WCS server

HLS ABR support

For a streams with video track (video only or audio+video) WCS supports HLS ABR in CDN (a qualities are encoded on a dedicated Transcoder node) and on a single node.

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• m4s container is used by default to record an HLS segments
• parameters with hls prefix are applied both to HLS and LL HLS
• parameters with ll_hls prefox are applied to LL HLS and to m4s container

Known issues

1. Non-recoverable freeze of HLS stream played in iOS Safari through a CDN

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