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Use MPD and the frontend of your choice for the audio server. Install Snapcast snapserver on the server and have MPD output the audio stream to it.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Use MPD and the frontend of your choice for the audio server. Install Snapcast snapserver on the server and have MPD output the audio stream to it.
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I use a really old Windows laptop (named Old Deller) to cast the audio output (using VB cable as an audio sink so the laptop doesn’t play the audio from its speakers) with the program https://github.com/SamDel/ChromeCast-Desktop-Audio-Streamer to a chrome cast audio home group (5 chromecast audio’s connected to various speaker sets). It works pretty well, they don’t go out of phase, but sometimes the chromecasts lose connection and it’s difficult to get it going again. Old Deller is old af (Vista sticker) and uses its Wifi card which may be some of the issues, or the chromecast audios might be finicky idk. Takes a few minutes to restart the comp and fuck with the app. It plays audio files with MusicBee + its remote app (iTunes remote app had an issue with giant playlists for a long time, idk if Apple ever fixed they seemed not to give a shit about the remote app) and it also uses VoiceMeeter to capture and play the audio from a physical XM Radio. There’s a 5-10 sec delay, which is no problem if just listening to music.
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owntone-server
Linux/FreeBSD DAAP (iTunes) and MPD audio server with support for AirPlay 1 and 2 speakers (multiroom), Apple Remote (and compatibles), Chromecast, Spotify and internet radio.
owntone (formerly forked-daapd) might be what you’re looking for. Not sure if there’s a published docker container.
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balena-sound
Build a single or multi-room streamer for an existing audio device using a Raspberry Pi! Supports Bluetooth, Airplay and Spotify Connect
Balena is designed to handle the multi room playback, but I haven't used it.
