Cutting pipeline in 2 bin

[Jack]

Hello,

I have a working pipeline like (with sound) :

filesrc name=source0 location=localisation/{place}/sounds/output.wav !
wavparse ! opusenc ! rtpopuspay !
application/x-rtp,media=audio,encoding-name=OPUS,payload=96,clock-rate=48000,channels=2
! webrtcbin name=sendrecv bundle-policy=max-bundle

But, when I try to split this pipeline into 2 bins and add/link them to
my pipeline, I can get the audio stream but there is no sound :

/// code /////////////////////////////////////////////////////////////
pipeline = Gst.Pipeline()

bin1 = Gst.parse_bin_from_description('filesrc name=source0
location=localisation/bruxelles/sounds/output.wav ! wavparse', True)

bin2 = Gst.parse_bin_from_description('opusenc ! rtpopuspay !
application/x-rtp,media=audio,encoding-name=OPUS,payload=96,clock-rate=48000,channels=2
! webrtcbin name=sendrecv bundle-policy=max-bundle', True)

pipeline.add(bin1)
pipeline.add(bin2)

bin1.link(bin2)

webrtc = pipeline.get_by_name('sendrecv')
webrtc.connect('on-negotiation-needed', self.on_negotiation_needed)
webrtc.connect('on-ice-candidate', self.on_ice_candidate)

pipeline.set_state(Gst.State.PLAYING)
/// end code /////////////////////////////////////////////////////////

Any idea of what is the problem here ?
++

Jack