I realize that my use-case of mkchromecast mostly would be to move the sound of mpd https://www.musicpd.org/ to the chromecast-audio. All this hooking up to pulseaudio or alsa would not really be necessary, perhaps rather unwanted. I may actually want to hear other sounds from the speakers on the computer.

So, having mkchromecast reading directly from a pipe or a http stream perhaps would make more sense. I assume the data here being already ogg, mp3 or so is not a problem (not really any overhead), since mkchromecast is doing the encoding anyway. What do you think?