<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le mar. 7 mai 2019 22 h 40, Halley Zhao <<a href="mailto:aihua.halley.zhao@gmail.com">aihua.halley.zhao@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr">export GST_DEBUG=*:4</div><div dir="ltr">there is gst log"<my_pipeline> notifying about state-changed READY to NULL (VOID_PENDING pending)", but no msg got on GstBus</div></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto">It's not really a bug. Messages are queued, and when GstPipeline goes to NULL state it flushes the bus in order to drop any remaining ref on pipeline elements.</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><br></div><div dir="ltr"><div>here are the log:</div><div><br></div><div><div>(bus_call, 84)my_pipeline state change, old state: PLAYING, new state: PAUSED</div><div>0:00:05.294249625 12094 0xebc8600 INFO GST_STATES gstelement.c:2658:gst_element_continue_state:<my_pipeline> continue state change PAUSED to READY, final NULL</div><div>0:00:05.294405000 12094 0xebc8600 INFO GST_STATES gstbin.c:2504:gst_bin_element_set_state:<my_sink> current PAUSED pending VOID_PENDING, desired next READY</div><div>0:00:05.294566500 12094 0xebc8600 INFO GST_STATES gstelement.c:2676:gst_element_continue_state:<my_sink> completed state change to READY</div><div>0:00:05.294626250 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_sink> notifying about state-changed PAUSED to READY (VOID_PENDING pending)</div><div>(bus_call, 84)my_sink state change, old state: PAUSED, new state: READY</div><div>0:00:05.294731000 12094 0xebc8600 INFO GST_STATES gstbin.c:2952:gst_bin_change_state_func:<my_pipeline> child 'my_sink' changed state to 2(READY) successfully</div><div>0:00:05.294849875 12094 0xebc8600 INFO GST_STATES gstbin.c:2504:gst_bin_element_set_state:<my_vdec> current PAUSED pending VOID_PENDING, desired next READY</div><div>0:00:05.317103625 12094 0xebc8600 INFO GST_STATES gstelement.c:2676:gst_element_continue_state:<my_vdec> completed state change to READY</div><div>0:00:05.317294250 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_vdec> notifying about state-changed PAUSED to READY (VOID_PENDING pending)</div><div>0:00:05.317593875 12094 0xebc8600 INFO GST_STATES gstbin.c:2952:gst_bin_change_state_func:<my_pipeline> child 'my_vdec' changed state to 2(READY) successfully</div><div>(bus_call, 84)my_vdec state change, old state: PAUSED, new state: READY</div><div>0:00:05.317717375 12094 0xebc8600 INFO GST_STATES gstbin.c:2504:gst_bin_element_set_state:<my_h264parse> current PAUSED pending VOID_PENDING, desired next READY</div><div>0:00:05.318214875 12094 0xebc8600 INFO GST_STATES gstelement.c:2676:gst_element_continue_state:<my_h264parse> completed state change to READY</div><div>0:00:05.318281375 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_h264parse> notifying about state-changed PAUSED to READY (VOID_PENDING pending)</div><div>(bus_call, 84)my_h264parse state change, old state: PAUSED, new state: READY</div><div>0:00:05.318393875 12094 0xebc8600 INFO GST_STATES gstbin.c:2952:gst_bin_change_state_func:<my_pipeline> child 'my_h264parse' changed state to 2(READY) successfully</div><div>0:00:05.318517750 12094 0xebc8600 INFO GST_STATES gstbin.c:2504:gst_bin_element_set_state:<my_appsrc> current PAUSED pending VOID_PENDING, desired next READY</div><div>0:00:05.318673500 12094 0xed408a0 INFO task gsttask.c:318:gst_task_func:<my_appsrc:src> Task resume from paused</div><div>0:00:05.319093500 12094 0xebc8600 INFO GST_STATES gstelement.c:2676:gst_element_continue_state:<my_appsrc> completed state change to READY</div><div>0:00:05.319155625 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_appsrc> notifying about state-changed PAUSED to READY (VOID_PENDING pending)</div><div>(bus_call, 84)my_appsrc state change, old state: PAUSED, new state: READY</div><div>0:00:05.319267375 12094 0xebc8600 INFO GST_STATES gstbin.c:2952:gst_bin_change_state_func:<my_pipeline> child 'my_appsrc' changed state to 2(READY) successfully</div><div>0:00:05.319451375 12094 0xebc8600 INFO GST_STATES gstelement.c:2651:gst_element_continue_state:<my_pipeline> committing state from PAUSED to READY, pending NULL, next NULL</div><div>0:00:05.319526500 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_pipeline> notifying about state-changed PAUSED to READY (NULL pending)</div><div>(bus_call, 84)my_pipeline state change, old state: PAUSED, new state: READY</div><div>0:00:05.319628625 12094 0xebc8600 INFO GST_STATES gstelement.c:2658:gst_element_continue_state:<my_pipeline> continue state change READY to NULL, final NULL</div><div>0:00:05.319799625 12094 0xebc8600 INFO GST_STATES gstbin.c:2504:gst_bin_element_set_state:<my_sink> current READY pending VOID_PENDING, desired next NULL</div><div>0:00:06.443495875 12094 0xebc8600 INFO GST_STATES gstelement.c:2676:gst_element_continue_state:<my_sink> completed state change to NULL</div><div>0:00:06.443610625 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_sink> notifying about state-changed READY to NULL (VOID_PENDING pending)</div><div>0:00:06.443782875 12094 0xebc8600 INFO GST_STATES gstbin.c:2952:gst_bin_change_state_func:<my_pipeline> child 'my_sink' changed state to 1(NULL) successfully</div><div>(bus_call, 84)my_sink state change, old state: READY, new state: NULL</div><div>0:00:06.443899625 12094 0xebc8600 INFO GST_STATES gstbin.c:2504:gst_bin_element_set_state:<my_vdec> current READY pending VOID_PENDING, desired next NULL</div><div>0:00:06.450190250 12094 0xebc8600 INFO GST_STATES gstelement.c:2676:gst_element_continue_state:<my_vdec> completed state change to NULL</div><div>0:00:06.450258625 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_vdec> notifying about state-changed READY to NULL (VOID_PENDING pending)</div><div>(bus_call, 84)my_vdec state change, old state: READY, new state: NULL</div><div>0:00:06.450385750 12094 0xebc8600 INFO GST_STATES gstbin.c:2952:gst_bin_change_state_func:<my_pipeline> child 'my_vdec' changed state to 1(NULL) successfully</div><div>0:00:06.450535125 12094 0xebc8600 INFO GST_STATES gstbin.c:2504:gst_bin_element_set_state:<my_h264parse> current READY pending VOID_PENDING, desired next NULL</div><div>0:00:06.450629625 12094 0xebc8600 INFO GST_STATES gstelement.c:2676:gst_element_continue_state:<my_h264parse> completed state change to NULL</div><div>0:00:06.450687375 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_h264parse> notifying about state-changed READY to NULL (VOID_PENDING pending)</div><div>(bus_call, 84)my_h264parse state change, old state: READY, new state: NULL</div><div>0:00:06.450794500 12094 0xebc8600 INFO GST_STATES gstbin.c:2952:gst_bin_change_state_func:<my_pipeline> child 'my_h264parse' changed state to 1(NULL) successfully</div><div>0:00:06.450913125 12094 0xebc8600 INFO GST_STATES gstbin.c:2504:gst_bin_element_set_state:<my_appsrc> current READY pending VOID_PENDING, desired next NULL</div><div>0:00:06.451000500 12094 0xebc8600 INFO GST_STATES gstelement.c:2676:gst_element_continue_state:<my_appsrc> completed state change to NULL</div><div>0:00:06.451056625 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_appsrc> notifying about state-changed READY to NULL (VOID_PENDING pending)</div><div>(bus_call, 84)my_appsrc state change, old state: READY, new state: NULL</div><div>0:00:06.451159125 12094 0xebc8600 INFO GST_STATES gstbin.c:2952:gst_bin_change_state_func:<my_pipeline> child 'my_appsrc' changed state to 1(NULL) successfully</div><div>0:00:06.451296000 12094 0xebc8600 INFO GST_STATES gstelement.c:2676:gst_element_continue_state:<my_pipeline> completed state change to NULL</div><div>0:00:06.451355500 12094 0xebc8600 INFO GST_STATES gstelement.c:2579:_priv_gst_element_state_changed:<my_pipeline> notifying about state-changed READY to NULL (VOID_PENDING pending)</div><div>(main, 282)unref the pipeline</div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Halley Zhao <<a href="mailto:aihua.halley.zhao@gmail.com" target="_blank" rel="noreferrer">aihua.halley.zhao@gmail.com</a>> 于2019年5月8日周三上午10:05写道：<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Hi experts:</div><div>I want to do cleanup after pipeline changed to GST_STATE_NULL. however I received GST_MESSAGE_STATE_CHANGED with newstate of GST_STATE_NULL of its children element, but not the pipeline itself.</div><div><br></div><div>I don't know whether there is something wrong in my code, or it is by design?</div><div>my pipeline contains "appsrc-->h264parse-->videodecode-->appsink". here is my log:</div><div>the source code sees attachment</div><div><br></div><div><div>(cb_need_data, 148)emit eos signal</div><div>(bus_call, 61)End of stream</div><div><br></div><div>(bus_call, 84)my_sink state change, old state: PLAYING, new state: PAUSED</div><div>(bus_call, 84)my_vdec state change, old state: PLAYING, new state: PAUSED</div><div>(bus_call, 84)my_h264parse state change, old state: PLAYING, new state: PAUSED</div><div>(bus_call, 84)my_appsrc state change, old state: PLAYING, new state: PAUSED</div><div>(bus_call, 84)my_pipeline state change, old state: PLAYING, new state: PAUSED</div><div>(bus_call, 84)my_sink state change, old state: PAUSED, new state: READY</div><div>(bus_call, 84)my_vdec state change, old state: PAUSED, new state: READY</div><div>(bus_call, 84)my_h264parse state change, old state: PAUSED, new state: READY</div><div>(bus_call, 84)my_appsrc state change, old state: PAUSED, new state: READY</div><div>(bus_call, 84)my_pipeline state change, old state: PAUSED, new state: READY</div><div>(bus_call, 84)my_sink state change, old state: READY, new state: NULL</div><div>(bus_call, 84)my_vdec state change, old state: READY, new state: NULL</div></div></div></div></div></div></div> </blockquote></div> _______________________________________________<br> gstreamer-devel mailing list<br> <a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank" rel="noreferrer">gstreamer-devel@lists.freedesktop.org</a><br> <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" rel="noreferrer noreferrer" target="_blank">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a></blockquote></div></div></div>