74HC139 2 to 4 Decoder/Demultiplexer IC consists of 2 mutually exclusive decoders with address inputs (nA0, nA1), outputs (nY0 to nY3), and enable pins. The IC can work either as a decoder or a demux. If the Enable pin(E’) is connected to the ground it works as a decoder whereas, if the Enable pin is connected to the VCC pin, it will work as a Demultiplexer. The 2 to 4 Decoder means that it has 2 input lines and 4 output lines along with an enable pin. The output pins for this decoder IC are active low, which means we will have an inverted output. So for the normal operation of the decoder IC, the E’ pin should be zero or grounded.

After some messing around and a lot of googling (mostly for the wrong thing) I have finally got this little app to work. The reason it did not work was I was missing a demultiplexer plugin for mrl, now that I have it I can use it.

I will write a bigger post/review after I have had chance to use it for a few days to see how it stacks up against rhythmbox. 

just in case you are having the same problem as me then use this.

sudo apt-get install libxine1-all-plugins