I want to change completely to linux (ubuntu or kubuntu) in the near future.
But i still have one problem: there seems to be no real good audio player/transcoder for linux that can do what i need.

What do i need?
- playback of aac (m4a/mp4), ac3, mp3, ogg vorbis, optimfrog (i love its dualstream-mode), wavpack (i made a backup of my whole cd collection with)
- cd-playback and ripping (not very important)
- possibility to include new formats
- encode in all the formats mentioned above
- transcode between all the formats mentioned above
- writing audio cds (not very important)
- support for replaygain
- DSP, especially something similar like foobars "advanced limiter" or "soft clipping limiter"
- possibility to use replaygain and DSP during en-/transcoding or cd writing
- tagging-support of id3v1, id3v2 (incl. embedded images) and apev2
- something similar like foobars masstagger

You see, i'm searching for a "foobar"-like solution for linux, because foobar itself unfortunately seems to be never ported to linux.

Please don't recommend me to use foobar with wine, because i want to change completely without any windows partition or windows programs.
That should be possible. Finally its often claimed that linux users are able to do everything that windows users can do...

This has already been discussed multiple times, try using the search feature. You're going to find alot of opinions on a variety of media players but one thing you are going to discover is that there is no perfect out of the box solution like foobar on linux yet. Some people are holding their breath for LAMIP but from the little i've heard about it, its fairly early in development. Most of the bundled progs like Rhythmbox and others technically support *insert format here* but because of licensing issues none of them will included the plugins by default and usually require alot of work to implement. I fought with Ubuntu for 2 weeks trying to get AAC Gstreamer support and I ended up giving up and using Foobar under wine. It was really annoying tracking down ubuntu deb repositories that even hosted those plugins and when I last checked you couldn't even use them in the stable release. Maybe things will be different when breezy badger comes out but who knows.

Amarok can use xine or GStreamer as a playback engine, and works pretty well for me. MAybe you shoud check if it does what you want.
No replaygain or apev2 support though.

I used the search function as a matter of course, but only found answers like "use foobar under wine". But i don'tw ant to use wine, i want a REAL linux solution.
LAMIP looks good but you're right: its under heavy development and most of the desired functions are not yet implemented.

Amarok is a good player but not the solution i've searched for.

Here is another thread.

I am afraid you need to compromise or write your own code. fb2k is an exception among audio players. You can't expect such a player will show up for UNIX anytime soon. Many people don't know about these formats, replaygain, and they don't care. Therefore the current available programs satisfy their needs.

I think that's certainly not true when it comes to audio applications. The situation might change if the FOSS world comes up with a layer like DirectX.

@atici
Maybe i should wait...

It looks like LAMIP is the player that could sometimes be the foobar-alternative on linux but until now it seems to be no real good player available that can do what i need.

Too bad, that foobars developers decided to not port it to linux.
The absence of such an excellent player is one of the few reasons that kept me away from completely changing to linux in the past (video playing/creating or music creating/editing solutions are also poor). And maybe still keep me away in the next future...

I suggest to get a dedicated computer for audio playback. This old thread might be a good starting point. Then run Windows XP Embedded with fb2k on that machine. It doesn't really matter what OS it runs since it will only be used for audio. And on your personal computer you can then run whatever OS you like.

This looks cool. I have not tried yet. It supports replaygain, ogg and with a plugin flac. That is all I need.

Triza

Exception appears to be the keyword, dependless of platform. I somehow don't think caring/knowing user share from Windows camp (esp outside HA), is that dramatically bigger then of those running *nix.
It's not hopeless, devs of most players emerging lately have heard at least about rg and implement it. As for formats, well if people won't come buzzing about some rare format, asking to add support, probably nothing will happen indeed.
FI it took about a year to get musepack support in mpd (though mostly due to the lack of C decoding lib back then). It groks aac/vorbis/flac/musepack now. I'd say quite useable playback solution. There's also lamip, and few others (though majority utilise gst or xine as backend).

Hmm, where and how DX would help?

Isn't this what the GStreamer project is targeting? If some one with the know-how would start making the plugins it would expose the decoders to a lot of different programs.

Playback of different formats is not the only point on my "wishlist".
I know, with gstreamer it could be easily managed in the near future.
But all my other points?
Especially encoding/transcoding in different formats with the use of rg ans dsp?
Or tagging-options with free definable fields (i mostly use fields like COMPOSER and COPYRIGHT in addition to the "normal" fields TRACKNUMBER, TITLE, ARTIST, ALBUM, GENRE, DATE, COMMENT)?

None of the current linux players seems to be able to handle it now.
Some players are supporting one or two points from my wishlist, but there is none that supports all. And i don't want to "replace" foobar with a handful of programs but only one program, because i want to have an installation as slim as possible (not a great amount of unnecessary programs, that will make my system complex and overloaded).

To code such a searched program myself is not possible. I don't understand anything 'bout programming. So i think, its necessary to wait a bit longer as i expected to change completely to linux...

You will not get all of those features at once in the near future. It might be necessary to point out that something like this also does not exist on windows - except of foobar. Foobar is an exception. If you want a 1:1 copy of its features on linux, then dream on - its probabably not gonna happen in the next 2 years and maybe also not in the next 4 years. Your best bet is to wait for LAMIP to get more mature, and then use it, sacrificing some features on your wishlist.