I have a number of aac type music files. These play correctly and until recently (playcount:3, last played 15/11/2013) the last played time always used to be updated when the track had finished. Now I get the message (in stdout/err) - FileTypeResolver: file /home/robert/Music/whatever.aac (mimetype audio/aac) not recognized as Amarok-compatible FileTypeResolver: file /home/robert/Music/whatever.aac (mimetype audio/aac) not recognized as Amarok-compatible (so twice on track completion) no update to last played and no message about scrobbling (which I have enabled) which also doesn't happen. It may not be recognised as compatible but it is played perfectly! I don't think this is related to bug #337849, has something related to kubuntu 14.10 changed here? kmimetype for that file returns audio/aac which isn't looked for in FileTypeResolver::createFile
Having recently changed the phonon backend from vlc to gstreamer - I see that this bug no longer happens with gstreamer. But I'd guess the problem is the amarok interaction with the backend rather than being a phonon problem. I still get the audio/acc not recognised message so probably this bit is a red-herring
*** This bug has been marked as a duplicate of bug 337849 ***