+++ This bug was initially created as a clone of Bug #398196 +++

Please describe the problem:
Rhythmbox doesn't recognise multichannel files (like: 5.1 mp3, 5.1 mp4-aac, 5.1 dts-wav, 5.1 ac3), and if it does (for example 5.1-mp3) than it isn't playable or only in stereo.

DTS sample files:
http://www.sr.se/cgi-bin/mall/index.asp?programid=2445


Steps to reproduce:
1. Download sample file
2. Open Rhythmbox
3. Import sample file
4. Play sample file


Actual results:
By most of them (especially mp4), rhythmbox gives an error at import for not recognising the filetype.
Otherwise You hear noises, nothing or the file is playing in stereo only.


Expected results:
Always play the file and an option to playing it in stereo or multichannel (one could be default).

Does this happen every time?
Yes, it happens every time.

Other information:
I would like to see an option (like in vlc for example) for how may channels i would like to listen (1.0 mono, 2.0 stereo, 2.1, 4.0, 4.1, 5.0, 5.1 multichannel). The default playback channel could be recognised from the file (5.1 files at 5.1 channels) or always stereo (downmix), but add an option to listen the multichannel file in multichannel surround.
Most of the files can be played in vlc or mplayer with full multichannel surround.