Two way audio slow and noisy

[Wes Miller]

I have made two useful discoveries.

1.  Add a gstrtpjitterbuffer to the udp receive pipeline.

udpsrc       port=8554
   !
application/x-rtp,media=audio,payload=8,clock-rate=8000,encoding-name=PCMA,channels=1  
   ! gstrtpjitterbuffer
   ! rtppcmadepay  
   ! audio/x-alaw,rate=8000,channels=1  
   ! decodebin  
   ! audioconvert  
   ! capsfilter     caps=audio/x-raw-int,rate=8000  
   ! identity        
   ! volume       volume=1.0
   ! level          
   ! queue2        
   ! audioresample  
   ! pulsesink    sync=false 

2.  Replace PCMA with PCMU.  Much of the noise goes away.  Some of the noise
I think is our hardware some may be introduced either by the physical
network or in the alsa and/or pulse drivers.

Wes



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