Complete an asynchronous start operation. When the subclass overrides the start method, it should call gstbase.base_src.BaseSrc.startComplete when the start operation completes either from the same thread or from an asynchronous helper thread.
a #GstFlowReturn
Complete an asynchronous start operation. When the subclass overrides the start method, it should call gstbase.base_src.BaseSrc.startComplete when the start operation completes either from the same thread or from an asynchronous helper thread.