change volume of pipeline created with gst_parse_launch()

[mapcol]

How can you change volume to pipelines like

pipe = gst_parse_launch("audiotestsrc ! audioconvert ! audioresample !
autoaudiosink");

This does not seem to work:
gdouble vol = 0.6;
g_object_set(pipe, "volume", vol, NULL);

Do I have to insert a ! volume ! element, then retrievet and set it's
property or is there another simplest way?



 



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