GstVideoUtils setVolume error custom pipe

[dbwat]

I work on a custom gst pipe to play videos with audio output to jackd. (ubuntu)

OF, Jack, videos and audio output linux

taking your example here here works …! I missed gst.startPipeline (); no doubt! ofGstVideoUtils gst; ofTexture texture; // ------------------------------------------------ -------------- ofApp :: void setup () { ofBackground (255,255,255); gst.setPipeline ("videotestsrc", 24, true, 320.240); gst.startPipeline (); gst.play (); texture.allocate (320.240, GL_RGB); } // ------------------------------------------------ -------------- void ofApp :: update () { gst.u…

here works well enough for easy reading.
I would like to change the volume of ofGstVideoUtils player with gst.setVolume (float) this is the message received:

  GLib-GObject-WARNING **: g_object_set_valist: object class 'GstPipeline' has no property named 'volume' 

is that you have an idea?
Bernard