Delete src and sink

When I delete one source (rtspsrc,rtph264depay,nvv4l2decoder and rtmpsinkbin), this source buffers in common elements(streammux,pgie, nvtracker, streamdemux) will go to streamdemux. Where will thbuffersey go after this
rtspsrc,rtph264depay,nvv4l2decoder \ -----------------------------------------------/>rtmpsinkbin
rtspsrc,rtph264depay,nvv4l2decoder – > streammux,pgie, nvtracker, streamdemux, ->rtmpsinkbin
rtspsrc,rtph264depay,nvv4l2decoder /-----------------------------------------------\>rtmpsinkbin

• Hardware Platform (Jetson / GPU)
• DeepStream Version
• JetPack Version (valid for Jetson only)
• TensorRT Version
• NVIDIA GPU Driver Version (valid for GPU only)

After you delete the source, it does not produce any buffer. Why do you say “this source buffers in common elements go to streamdemux”?