                   ng-click="microphone.playSource();" >
                <md-icon>play_circle_filled</md-icon>
                Play Encoded MP4</md-button>

            <md-button id="outputButton"
                       class="md-raised md-primary md-hue-3"
                       ng-disabled="!microphoneOutputAudioReady"
                       ng-click="microphone.playOutput();">
                <md-icon>play_circle_outline</md-icon>
                Play Decoded WAV</md-button>

        </md-content>

    