Harness.play

void play()

This will set the harnessed #GstElement to [gst.types.State.Playing]. #GstElements without a sink-#GstPad and with the [gst.types.ElementFlags.Source] flag set is considered a src #GstElement Non-src #GstElements (like sinks and filters) are automatically set to playing by the #GstHarness, but src #GstElements are not to avoid them starting to produce buffers. Hence, for src #GstElement you must call [gstcheck.harness.Harness.play] explicitly.

MT safe.