I dont understand yet how icecast works...
Can it play as an internet-radio or is it just only a server and has to get the music from mpd or so?
Sorry if i my ask silly questions...
No worries, we all start somewhere
My understanding is that Icecast is a streaming server that you can use to push content out onto the internet along with listening to Radio streams via a relay - however I'm doing a bit of educated guessing here as I don't use the software
Icecast is a streaming media (audio/video) server which currently supports Ogg (Vorbis and Theora), Opus, WebM and MP3 streams.
It can be used to create an Internet radio station or a privately running jukebox and many things in between. It is very versatile in that new formats can be added relatively easily and supports open standards for communication and interaction.
MPD is a music streamer that does the same thing but locally, for example I have MPD addon install and pointing at my music directory. This is then available on my two raspberry pi's using Rune Audio - http://www.runeaudio.com/ which I control via MPDroid on my android phone.
IMHO I think the questions you might want to ask is before diving into Icecast are
- What content do I want to access - music, photos and films etc
- Where I am going to do this - home, work etc
- What devices do I have available - XBox, Playstation, Smart TV, Kodi Box, Phone etc
Once you've answered those you can start choosing the most suitable software to install on your NAS. Plex and Emby work will as stream anywhere solution. Kodi and Samba share work nicely if you have a PC attached to your TV.
There are loads of solutions out there