I have a twonkyserver on a linux machine and Philips NP2500 player, detected as a "Philips Music Player NP2x00"
Announced to support :
MP3, WMA, AAC non DRM (m4A), eAAC+, FLAC, Ogg Vorbis.
The player can't play any mpeg4, ogg, flac or wav files from TwonkyServer. (I didn't test other upnp services.)
I always get the same error message from the NP2500. "Can't open the file "foobar" "
PS: I also opened a thread on the linux OS section cause I can't transcode those files to mp3.
The problem is I am also owner of the wonderful Roku SoundBridge Radio
who support WMA, AAC*, ALAC, MP3, WAV, AIFF
and a NOXON iRadio
who support MP3 (up to 320 kBits/s, CBR/VBR), AAC+, WAV, WMA-9 (up to 320 kBits/s) without DRM
Here is a log from the Status administration Page of TwonkyServer :
Flux locaux actifs:
NOXON 15:46:38 /media/nas/Musique/Bach, J.S/1989 - English Philharmonic, Simon Addison/Brandenburg Concertos 4, 5, 6/04 -  D maj BWV 1050 , Allegro.m4a
Philips NP2500 15:41:55 /media/nas/Musique/Bach, J.S/Brandenburg Concertos # 4 - 5 - 6/04 - Brandenburg Concerto No. 5 in D-Dur_BW 1050_ Allegro.mp3
(Only because I uploaded the mp3 version on the same directory...)
SoundBridge Radio 15:41:45 /media/nas/Musique/Bach, J.S/1989 - English Philharmonic, Simon Addison/Brandenburg Concertos 4, 5, 6/04 -  D maj BWV 1050 , Allegro.m4a
My question is:
Why the philips NP2500 can't play "AAC non DRM (m4A)" files while the Roku and Noxon work like a charm?