Function called for each pad when using gst.element.Element.foreachSinkPad, gst.element.Element.foreachSrcPad, or gst.element.Element.foreachPad.
false to stop iterating pads, true to continue
Function called for each pad when using gst.element.Element.foreachSinkPad, gst.element.Element.foreachSrcPad, or gst.element.Element.foreachPad.