<div dir="ltr">I had tried to build the example at the beginning of the page <div><a href="https://gstreamer.freedesktop.org/documentation/application-development/advanced/pipeline-manipulation.html">https://gstreamer.freedesktop.org/documentation/application-development/advanced/pipeline-manipulation.html</a><br></div><div>The statement:</div><div>

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<br></div><div>returns a null value.</div><div><br></div><div>James</div></div>