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cdn [2025/02/06 01:37] – [Stream-URLs] ischluffcdn [2025/11/03 12:23] (current) – ischluff
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 <bootnote> <bootnote>
-This documentation describes our Livestreaming CDN as of 2024.+This documentation describes our Livestreaming CDN as of 2025.
  
 The File-CDN for media.ccc.de is described on [[software:voctoweb]]. The File-CDN for media.ccc.de is described on [[software:voctoweb]].
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 == Architecture == Architecture
-The CDN-Cascade has 6 stages: Master-Encoder, Ingest, Transcoder, Master-Relays, Edge-Relays and finally Load-balancers.+The CDN-Cascade has 6 stages: Encoder, Ingest, Transcoder, Origin-Relays, Edge-Relays and finally Load-balancers. 
 +{{:cdn_overview.drawio.png|}}
  
-{{:cdn_overview.png?1200|}} +=== 1. Encoder 
- +The initial stream encoding is created near the stage on the encoder PC running voctomix or any video-encoder for third party streams. 
-=== 1. Master-Encoder +The encoding usually contains a 1080p25 H264 video signal, the slides as 1080p5 and up to 3 tracks of audio encoded in AAC (Native, Translated, Translated-2).
-The master stream encoding is created near the stage on the encoder PC running voctomix or on with other videoencoder for third party streams. +
-The master encoding contains a 1080p25 H264 video signal, the slides as 1080p5 and up to 3 tracks of audio encoded in AAC (Native, Translated, Translated-2).+
 The translated audio tracks and the slide video track are optional. The translated audio tracks and the slide video track are optional.
  
-The master encoding is pushed as MPEG-TS via SRT to the ingest stage.+The origin encoding is pushed as MPEG-TS via SRT to the ingest stage.
  
 === 2. Ingest === 2. Ingest
-The ingest machines run both [[https://github.com/voc/srtrelay|srtrelay]] and nginx-rtmp to receive pushed streams from the master encoders. This also serves as the entry point for third party streams.+The ingest machines run both [[https://github.com/voc/srtrelay|srtrelay]] and nginx-rtmp to receive pushed streams from the encoders. This also serves as the entry point for third party streams.
  
 Additionally the ingest machines run a stream-api daemon which scrapes the local stream information from both srtrelay and nginx-rtmp and publishes it to consul KV. Additionally the ingest machines run a stream-api daemon which scrapes the local stream information from both srtrelay and nginx-rtmp and publishes it to consul KV.
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 The transcode updates are also published to the #voc-wok IRC. The transcode updates are also published to the #voc-wok IRC.
  
-The transcoding outputs are directly pushed with HTTP uploads to the Master relay. To ensure proper retries the uploads are sent over a local http-proxy (https://github.com/voc/stream-api/tree/master/cmd/upload-proxy).+The transcoding outputs are directly pushed with HTTP uploads to the Origin relays. To ensure proper retries the uploads are sent over a local http-proxy (https://github.com/voc/stream-api/tree/master/cmd/upload-proxy).
  
-=== 4. Master Relay +=== 4. Origin Relays 
-Runs the upload server (https://github.com/voc/stream-api/tree/master/cmd/upload-server) which receives the http uploads and stores the files on local disk.+Origin relays run the upload server (https://github.com/voc/stream-api/tree/master/cmd/upload-server) which receives the http uploads and stores the files on local disk.
 The upload server has some additional logic to rewrite the HLS playlists on the fly in order to properly handle stream restarts. The upload server has some additional logic to rewrite the HLS playlists on the fly in order to properly handle stream restarts.
  
-The segmented streams, thumbnails etc. are served by nginx.+The segmented streams, thumbnails etc. are currently served by nginx.
  
 === 5. Edge-Relays === 5. Edge-Relays
-The edge relays run nginx with caching proxy config and upstream set to the master relay.+The edge relays run nginx with caching proxy config and upstream set to the active origin relay.
  
 === 6. Loadbalancer === 6. Loadbalancer
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   * http://cdn.c3voc.de/hls/@slug/translated-2_sd.m3u8   * http://cdn.c3voc.de/hls/@slug/translated-2_sd.m3u8
  
-Currently not active:+**Currently not active:**
  
 MPEG-DASH (VPx multi-quality + multi-language) MPEG-DASH (VPx multi-quality + multi-language)
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 * http://cdn.c3voc.de/@slug_translated.opus * http://cdn.c3voc.de/@slug_translated.opus
 * http://cdn.c3voc.de/@slug_translated-2.opus * http://cdn.c3voc.de/@slug_translated-2.opus
- 
 == Dynamic SRT/RTMP endpoints with RTMP Auth == Dynamic SRT/RTMP endpoints with RTMP Auth
 SRT and RTMP Endpoints can be created under https://ingest.c3voc.de/backend/ (Password in keepass under ansible/stream-api/htpasswd). After creating the endpoint the stream can be pushed to any ingest machine. SRT and RTMP Endpoints can be created under https://ingest.c3voc.de/backend/ (Password in keepass under ansible/stream-api/htpasswd). After creating the endpoint the stream can be pushed to any ingest machine.
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  * Building a live status dashboard which shows the current stream->ingest->transcoder pipelines  * Building a live status dashboard which shows the current stream->ingest->transcoder pipelines
  * To gracefully shutdown a relay it could be instructed via consul KV to redirect all clients back to a load balancer while taking it out of the haproxy redirects. That way all clients would be redistributed to different relays.  * To gracefully shutdown a relay it could be instructed via consul KV to redirect all clients back to a load balancer while taking it out of the haproxy redirects. That way all clients would be redistributed to different relays.
- * Build master relay redundancy using dynamic upload client and relay upstream configuration. (Relay upstreams need to be sticky, because the HLS playlists generated on the master relay are not deterministic)+ * Build origin relay redundancy using dynamic upload client and relay upstream configuration. (Relay upstreams need to be sticky, because the HLS playlists generated on the origin relay are not deterministic)
  * Use DNS rotation on ingest  * Use DNS rotation on ingest
  * Finalize srtrelay meshing to allow pushed streams to be pulled from any ingest machine.  * Finalize srtrelay meshing to allow pushed streams to be pulled from any ingest machine.
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