DAC+/Raspbian Jessie/mpd: Can not play m4a files, mp3's work fine

Hope this isn't too stupid a question and I didn't (again) overlook something obvious, but I'm having trouble playing m4a files with mpd on my new Raspberry Pi 2 running Raspbian Jessie. Here's what mpd logs when I try it:
Oct 12 18:50 : player: played "*/Manuel/Music/Al*20Andaluz*20Project/Deus*20et*20Diabolus/01*20Morena.m4a"
Oct 12 18:50 : ffmpeg/mov,mp4,m4a,3gp,3g2,mj2: max_analyze_duration 5000000 reached
Oct 12 18:50 : alsa_output: Failed to open "My ALSA Device" [alsa]: Error opening ALSA device "default" (snd_pcm_hw_params): Invalid argument
Oct 12 18:50 : output: Failed to open audio output
Oct 12 18:50 : player: problems opening audio device while playing "*/Manuel/Music/Al*20Andaluz*20Project/Deus*20et*20Diabolus/01*20Morena.m4a"

The "failed to open ... device" messages look suspicious and I suggest some major error on my part. However, mp3 files play flawlessly, so I'm not too sure where to look for my mistake.

Any help greatly appreciated, thanks in advance!


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