flacparse: Only calculate with durations != -1
flacparse: Only calculate with durations != -1

surround-io/gst-plugins-good,surround-io/gst-plugins-good,wkatsak/gst-plugins-good,vatavuserban/gst-plugins-good,vatavuserban/gst-plugins-good,wkatsak/gst-plugins-good,ndufresne/gst-plugins-good,vatavuserban/gst-plugins-good,ndufresne/gst-plugins-good,jpakkane/gstreamer-plugins-good,wkatsak/gst-plugins-good,ndufresne/gst-plugins-good,jpakkane/gstreamer-plugins-good,vatavuserban/gst-plugins-good,surround-io/gst-plugins-good,ndufresne/gst-plugins-good,wkatsak/gst-plugins-good,jpakkane/gstreamer-plugins-good,surround-io/gst-plugins-good,jpakkane/gstreamer-plugins-good