GStreamer on ROS using common_audio package

[piti_wity]

I am working on a ROS project where I need to stream audio from a raspberry
PI 3 to my computer. 

At the moment I am working only on the raspberry and I have worked out a
correct gstreamer pipeline to be used, which is the following:

gst-launch-0.10 alsasrc device=hw:1,0 ! audioconvert ! audioresample !
alsasink

Anyway, when I use the ROS package audio_common (
<href="http://wiki.ros.org/audio_common"> ), in particular the 
audio_capture feature 
(
<href="https://github.com/ros-drivers/audio_common/blob/master/audio_capture/src/audio_capture.cpp">
) 
the error [ERROR] [1506519371.050052798]: Failed to create encoder element
pops out.

I tried a lots of difference set-ups and several plugins, but since gstream
is correctly working when I launch it from the command line, I am quite sure
that it is due to some configuration issues. 

Thanks a lot in advance.



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