gnlcomposition plays only first clip

[aetitcomb]

I'm having trouble concatenating two audio clips back-to-back.  Ultimately, I
want them to overlap . . . but, I can't even get them both to play one after
the other.   

Here's my script:

#!/usr/local/bin/python

import sys
import gobject, pygst
import gst

class GStreamerAudio(object):

    def __init__(self):
        gobject.threads_init()

        # create the pipeline ----
        self.pipeline = gst.Pipeline("audioPipeline")

        # create a gnlcomposition ----
        self.comp = gst.element_factory_make("gnlcomposition",
"audioComposition")
        self.pipeline.add(self.comp)
        self.comp.connect("pad-added", self.OnPad)

        # create an audioconvert ----
        self.audioConverter = gst.element_factory_make("audioconvert",
"audioConverter")
        self.pipeline.add(self.audioConverter)

        # create an alsasink for live output ----
        self.sink = gst.element_factory_make("alsasink", "alsasink")
        self.pipeline.add(self.sink)
        self.audioConverter.link(self.sink)

        # create file sources for each track ----
        file0 = '/usr/home/bobbybrady/test1.aiff'
        file1 = '/usr/home/cindybrady/test2.aiff'

        audio0 = gst.element_factory_make("gnlfilesource", "audio0")
        self.comp.add(audio0)
        audio0.set_property("location", file0)
        audio0.set_property("start",0 * gst.SECOND)
        audio0.set_property("duration", 4 * gst.SECOND)
        audio0.set_property("media-start", 0 * gst.SECOND)
        audio0.set_property("media-duration", 4 * gst.SECOND)

        audio1 = gst.element_factory_make("gnlfilesource", "audio1")
        self.comp.add(audio1)
        audio1.set_property("location", file1)
        audio1.set_property("start", 4 * gst.SECOND)
        audio1.set_property("duration", 3 * gst.SECOND)
        audio1.set_property("media-start", 0 * gst.SECOND)
        audio1.set_property("media-duration", 3 * gst.SECOND)

        self.pipeline.set_state(gst.STATE_PLAYING)

        # wait for keyboard input 
        raw_input('Press enter to stop playing...')

    def OnPad(self, comp, pad):
        convpad = self.audioConverter.get_compatible_pad(pad,
pad.get_caps())
        pad.link(convpad)

if __name__ == '__main__':
    GStreamerAudio()





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