Version: (using KDE KDE 3.2.1) Installed from: Compiled From Sources Compiler: gcc 3.2.3 OS: Linux When playing AAC/M4A files in noatun or kaboodle, a small video window pops (it never gets painted; just a frame) and short variable length bursts of full intensity white noise (0.5 - 2 seconds, with 0.5 - 1 second gaps in between) are played. This is on Gentoo/PPC with kernel 2.6.4. mplayer plays the same files perfectly. This is probably an endianness bug, or something.
I wasn't aware that aRts had AAC support. Is it possible that the sound system thinks it's trying to play an MP3 file?
aRts has AAC playback if Xine has. The empty window is an artifact of playing audio through a video-codec like the aRts-Xine plugin is. Try playing the file in Xine and see if it can handle it. Also if the file is encrypted, nothing on Linux can play it.
Closing. The problem with the small empty window has been solved, and unencrypted AAC/M4A is implemented through xine_artsplugin.