<div dir="ltr">Hello. When removing a bin from a pipeline, the pipeline hangs sometimes like a deadlock. I attached an image about the structure of the pipeline and bin. Raspberry Pi 3B+ (5.10.73-v7) Qt 5.15.2 GStreamer 1.18.5 I'm using the above environment. The problem is that the bin is setted to GST_STATE_NULL and removed from the pipeline to release, but the pipeline hangs after that. Element filesink changed state from READY to PAUSED. Element filesink changed state from PAUSED to READY. Element bin5 changed state from PAUSED to READY. Element bin5 changed state from READY to NULL. The state changes of the above elements seem to have been done successfully, but it hangs and I couldn't see any changes in qmlglsink. However, the main thread is alive and that occurs OOM because it pushes the buffer to appsrc continuously. If I put `block=true` in appsrc, OOM doesn't occur. but the problem is the same. I added the GST_PAD_PROBE_TYPE_IDLE probe callback to src pad of the tee to remove the bin from the pipeline, In callback, unlink tee's sink pad and get peer pad from avimux's src pad and send eos event downstream. (The reason for getting the peer pad from avimux is that interaudiosrc does not passthrough events to downstream) And add GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM probe callback to sink pad of filesink, when filesink is received an eos event, it register a `set 'GST_STATE_NULL' and gst_bin_remove` callback to the Qt event queue. (to avoid race condition) I don't know the reason that the pipeline hangs and does not work properly. Please, Is there any solution for this problem? Thanks for reading. </div>