but why one of the sink never gets a buffer？and how can i resolve this？here is my code，thanks！ https://devtalk.nvidia.com/default/topic/1048680/deepstream-for-tesla/gst_base_sink_wait_preroll/ <https://devtalk.nvidia.com/default/topic/1048680/deepstream-for-tesla/gst_base_sink_wait_preroll/> -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/