OK so all works fine with a rpi2 and HiFiBerry amp+ system running Volumio 1.55.
However whenever I try and play a m4a file directly with a Bubble upnp client the music starts but stops and moves to the next track in playlist. I get about 1 or 2 seconds of music before song auto stops on its own and advances to next song.
I can audio cast song by turning on audio cast in Bubble and playing the song in a video player app on the Bubble client. However casting is converting the m4a format to a 44.1 khz format on the client which solves the no m4a’s on Volumio.
My guess is that I have to modify mpd.conf. All inputs are welcome on how to solve the issue.