Spike: SRT streaming

[fusion2004]

We should experiment with transcoding the files still to mp3 codec, but to MPEGTS containers, and streaming those to a mux audio-only livestream via the SRT ingestion endpoint. This would allow us to stop running icecast and rely on mux or other video services that support SRT (like Twitch

https://github.com/Haivision/srt/blob/master/docs/apps/srt-live-transmit.md
https://www.mux.com/blog/live-streaming-on-mux-more-secure-more-reliable-and-more-transport
https://eyevinntechnology.medium.com/using-ffmpeg-and-srt-to-transport-video-signal-to-the-cloud-7160960f846a
https://eyevinntechnology.medium.com/generate-mpeg-ts-from-file-with-ffmpeg-7561181e6369
https://docs.mux.com/guides/use-srt-to-live-stream
https://medium.com/@toshvelaga/live-streaming-with-ffmpeg-and-node-js-55b020dff74
https://docs.mux.com/guides/use-srt-to-live-stream
https://github.com/Eyevinn/node-srt