#0  0x00007fed0b7d4f79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
  [Error: ../nptl/sysdeps/unix/sysv/linux/raise.c was not found in source tree]
#1  0x00007fed0b7d8388 in __GI_abort () at abort.c:89
  [Error: abort.c was not found in source tree]
#2  0x00000000004b74b9 in mono_handle_native_sigsegv (signal=signal@entry=11, ctx=ctx@entry=0x7fed09007ac0) at mini-exceptions.c:2335
  [Error: mini-exceptions.c was not found in source tree]
#3  0x000000000050f13b in mono_arch_handle_altstack_exception (sigctx=sigctx@entry=0x7fed09007ac0, fault_addr=<optimized out>, stack_ovf=stack_ovf@entry=0) at exceptions-amd64.c:908
  [Error: exceptions-amd64.c was not found in source tree]
#4  0x0000000000423d22 in mono_sigsegv_signal_handler (_dummy=11, info=0x7fed09007bf0, context=0x7fed09007ac0) at mini.c:6769
  [Error: mini.c was not found in source tree]
#5  <signal handler called>
#6  strlen () at ../sysdeps/x86_64/strlen.S:106
  [Error: ../sysdeps/x86_64/strlen.S was not found in source tree]
#7  0x00007fed0865db03 in ?? ()
#8  0x0000000000000280 in ?? ()
#9  0x00007fecd528e068 in ?? ()
#10 0x00000000031ba2c0 in ?? ()
#11 0x00007fed0314659d in ?? ()
#12 0x0000000000000200 in ?? ()
#13 0x00007fecf5c1ac24 in gst_structure_copy (structure=0x31acd00) at gststructure.c:349
  344: #ifdef USE_POISONING
  345:   memset (structure, 0xff, sizeof (GstStructure));
  346: #endif
  347:   g_slice_free (GstStructure, structure);
  348: }
  349: 
  350: /**
  351:  * gst_structure_get_name:
  352:  * @structure: a #GstStructure
  353:  *
  354:  * Get the name of @structure as a string.
#14 0x00007fecf5c20979 in __gst_tag_list_copy (list=0x439dcf0) at gsttaglist.c:715
  710:   return list;
  711: }
  712: 
  713: /**
  714:  * gst_tag_list_to_string:
  715:  * @list: a #GstTagList
  716:  *
  717:  * Serializes a tag list to a string.
  718:  *
  719:  * Returns: a newly-allocated string, or NULL in case of an error. The
  720:  *    string must be freed with g_free() when no longer needed.
#15 0x00007fecf5ebcaa5 in gst_tag_list_copy (taglist=<optimized out>) at ../../../gst/gsttaglist.h:439
  [Error: ../../../gst/gsttaglist.h was not found in source tree]
#16 gst_base_sink_default_event (basesink=0x4322800, event=0x3a93700) at gstbasesink.c:3072
  3067:            * protected by the object lock so we can read it when
  3068:            * answering the POSITION query. */
  3069:           GST_OBJECT_LOCK (basesink);
  3070:           basesink->eos = TRUE;
  3071:           GST_OBJECT_UNLOCK (basesink);
  3072: 
  3073:           /* ok, now we can post the message */
  3074:           GST_DEBUG_OBJECT (basesink, "Now posting EOS");
  3075: 
  3076:           message = gst_message_new_eos (GST_OBJECT_CAST (basesink));
  3077:           gst_message_set_seqnum (message, seqnum);
#17 0x00007fece51e614f in gst_fake_sink_event (bsink=0x4322800, event=0x3a93700) at gstfakesink.c:383
  378: {
  379:   /* FIXME: this hacks around a bug in GLib/GObject: doing concurrent
  380:    * g_object_notify() on the same object might lead to crashes, see
  381:    * http://bugzilla.gnome.org/show_bug.cgi?id=166020#c60 and follow-ups.
  382:    * So we really don't want to do a g_object_notify() here for out-of-band
  383:    * events with the streaming thread possibly also doing a g_object_notify()
  384:    * for an in-band buffer or event. This is fixed in GLib >= 2.26 */
  385: #if !GLIB_CHECK_VERSION(2,26,0)
  386:   g_static_rec_mutex_lock (&sink->notify_lock);
  387:   g_object_notify ((GObject *) sink, "last-message");
  388:   g_static_rec_mutex_unlock (&sink->notify_lock);
#18 0x00007fecf5eb737d in gst_base_sink_event (pad=<optimized out>, parent=0x4322800, event=0x3a93700) at gstbasesink.c:3138
  3133:       duration = GST_BUFFER_DURATION (GST_BUFFER_CAST (sync_obj));
  3134: 
  3135:       GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
  3136:           "qos: dropped buffer rt %" GST_TIME_FORMAT ", st %" GST_TIME_FORMAT
  3137:           ", ts %" GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT,
  3138:           GST_TIME_ARGS (priv->current_rstart),
  3139:           GST_TIME_ARGS (priv->current_sstart), GST_TIME_ARGS (timestamp),
  3140:           GST_TIME_ARGS (duration));
  3141:       GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
  3142:           "qos: rendered %" G_GUINT64_FORMAT ", dropped %" G_GUINT64_FORMAT,
  3143:           priv->rendered, priv->dropped);
#19 0x00007fecf5bf76cb in gst_pad_send_event_unchecked (pad=pad@entry=0x3739870, event=event@entry=0x3a93700, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) at gstpad.c:5035
  5030:     return GST_FLOW_NOT_NEGOTIATED;
  5031:   }
  5032: }
  5033: 
  5034: /**
  5035:  * gst_pad_get_range:
  5036:  * @pad: a src #GstPad, returns #GST_FLOW_ERROR if not.
  5037:  * @offset: The start offset of the buffer
  5038:  * @size: The length of the buffer
  5039:  * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer,
  5040:  *     returns #GST_FLOW_ERROR if %NULL.
#20 0x00007fecf5bf7eb4 in gst_pad_push_event_unchecked (pad=pad@entry=0x7feccc07abe0, event=0x3a93700, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) at gstpad.c:4731
  4726:     GstPadPushCache scache = { NULL, };
  4727: 
  4728:     GST_LOG_OBJECT (pad, "Taking slow path");
  4729: 
  4730:     ret = gst_pad_push_data (pad, TRUE, buffer, &scache);
  4731: 
  4732:     if (scache.peer) {
  4733:       GstPadPushCache *ncache;
  4734: 
  4735:       GST_LOG_OBJECT (pad, "Caching push data");
  4736: 
#21 0x00007fecf5bf8328 in push_sticky (pad=0x7feccc07abe0, ev=0x7fecd528e3b0, user_data=0x7fecd528e410) at gstpad.c:3370
  3365: /**
  3366:  * gst_pad_iterate_internal_links:
  3367:  * @pad: the GstPad to get the internal links of.
  3368:  *
  3369:  * Gets an iterator for the pads to which the given pad is linked to inside
  3370:  * of the parent element.
  3371:  *
  3372:  * Each #GstPad element yielded by the iterator will have its refcount increased,
  3373:  * so unref after use.
  3374:  *
  3375:  * Free-function: gst_iterator_free
#22 0x00007fecf5bf6622 in events_foreach (pad=pad@entry=0x7feccc07abe0, func=func@entry=0x7fecf5bf81d0 <push_sticky>, user_data=user_data@entry=0x7fecd528e410) at gstpad.c:530
  525: /**
  526:  * gst_pad_new:
  527:  * @name: the name of the new pad.
  528:  * @direction: the #GstPadDirection of the pad.
  529:  *
  530:  * Creates a new pad with the given name in the given direction.
  531:  * If name is NULL, a guaranteed unique name (across all pads)
  532:  * will be assigned.
  533:  * This function makes a copy of the name so you can safely free the name.
  534:  *
  535:  * Returns: (transfer full): a new #GstPad, or NULL in case of an error.
#23 0x00007fecf5c005f8 in check_sticky (event=0x3a93700, pad=0x7feccc07abe0) at gstpad.c:3426
  3421:  * Deprecated: This function does not ref the pads in the list so that they
  3422:  * could become invalid by the time the application accesses them. It's also
  3423:  * possible that the list changes while handling the pads, which the caller of
  3424:  * this function is unable to know. Use the thread-safe
  3425:  * gst_pad_iterate_internal_links_default() instead.
  3426:  */
  3427: #ifndef GST_REMOVE_DEPRECATED
  3428: GList *
  3429: gst_pad_get_internal_links_default (GstPad * pad)
  3430: {
  3431:   GList *res = NULL;
#24 gst_pad_push_event (pad=0x7feccc07abe0, event=event@entry=0x3a93700) at gstpad.c:4848
  4843: 
  4844:     if (scache.peer) {
  4845:       GstPadPushCache *ncache;
  4846: 
  4847:       GST_LOG_OBJECT (pad, "Caching push data");
  4848: 
  4849:       /* make cache structure */
  4850:       ncache = g_slice_new (GstPadPushCache);
  4851:       *ncache = scache;
  4852: 
  4853:       pad_put_cache (pad, ncache, cache_ptr);
#25 0x00007fecf5ed0306 in gst_base_transform_sink_eventfunc (trans=0x3752400, event=0x3a93700) at gstbasetransform.c:1879
  1874:           sink_suggest, sink_suggest, priv->size_suggest);
  1875:     } else {
  1876:       GST_DEBUG_OBJECT (trans,
  1877:           "have suggestion equal to upstream caps %p %" GST_PTR_FORMAT, caps,
  1878:           caps);
  1879:       gst_caps_replace (&sink_suggest, caps);
  1880:       size_suggest = size;
  1881:       suggest = FALSE;
  1882:     }
  1883:     priv->suggest_pending = FALSE;
  1884:     GST_OBJECT_UNLOCK (pad);
#26 0x00007fecf5bf76cb in gst_pad_send_event_unchecked (pad=pad@entry=0x3739640, event=event@entry=0x3a93700, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) at gstpad.c:5035
  5030:     return GST_FLOW_NOT_NEGOTIATED;
  5031:   }
  5032: }
  5033: 
  5034: /**
  5035:  * gst_pad_get_range:
  5036:  * @pad: a src #GstPad, returns #GST_FLOW_ERROR if not.
  5037:  * @offset: The start offset of the buffer
  5038:  * @size: The length of the buffer
  5039:  * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer,
  5040:  *     returns #GST_FLOW_ERROR if %NULL.
#27 0x00007fecf5bf7eb4 in gst_pad_push_event_unchecked (pad=pad@entry=0x3738fb0, event=0x3a93700, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) at gstpad.c:4731
  4726:     GstPadPushCache scache = { NULL, };
  4727: 
  4728:     GST_LOG_OBJECT (pad, "Taking slow path");
  4729: 
  4730:     ret = gst_pad_push_data (pad, TRUE, buffer, &scache);
  4731: 
  4732:     if (scache.peer) {
  4733:       GstPadPushCache *ncache;
  4734: 
  4735:       GST_LOG_OBJECT (pad, "Caching push data");
  4736: 
#28 0x00007fecf5bf8328 in push_sticky (pad=0x3738fb0, ev=0x7fecd528e690, user_data=0x7fecd528e6f0) at gstpad.c:3370
  3365: /**
  3366:  * gst_pad_iterate_internal_links:
  3367:  * @pad: the GstPad to get the internal links of.
  3368:  *
  3369:  * Gets an iterator for the pads to which the given pad is linked to inside
  3370:  * of the parent element.
  3371:  *
  3372:  * Each #GstPad element yielded by the iterator will have its refcount increased,
  3373:  * so unref after use.
  3374:  *
  3375:  * Free-function: gst_iterator_free
#29 0x00007fecf5bf6622 in events_foreach (pad=pad@entry=0x3738fb0, func=func@entry=0x7fecf5bf81d0 <push_sticky>, user_data=user_data@entry=0x7fecd528e6f0) at gstpad.c:530
  525: /**
  526:  * gst_pad_new:
  527:  * @name: the name of the new pad.
  528:  * @direction: the #GstPadDirection of the pad.
  529:  *
  530:  * Creates a new pad with the given name in the given direction.
  531:  * If name is NULL, a guaranteed unique name (across all pads)
  532:  * will be assigned.
  533:  * This function makes a copy of the name so you can safely free the name.
  534:  *
  535:  * Returns: (transfer full): a new #GstPad, or NULL in case of an error.
#30 0x00007fecf5c005f8 in check_sticky (event=0x3a93700, pad=0x3738fb0) at gstpad.c:3426
  3421:  * Deprecated: This function does not ref the pads in the list so that they
  3422:  * could become invalid by the time the application accesses them. It's also
  3423:  * possible that the list changes while handling the pads, which the caller of
  3424:  * this function is unable to know. Use the thread-safe
  3425:  * gst_pad_iterate_internal_links_default() instead.
  3426:  */
  3427: #ifndef GST_REMOVE_DEPRECATED
  3428: GList *
  3429: gst_pad_get_internal_links_default (GstPad * pad)
  3430: {
  3431:   GList *res = NULL;
#31 gst_pad_push_event (pad=0x3738fb0, event=event@entry=0x3a93700) at gstpad.c:4848
  4843: 
  4844:     if (scache.peer) {
  4845:       GstPadPushCache *ncache;
  4846: 
  4847:       GST_LOG_OBJECT (pad, "Caching push data");
  4848: 
  4849:       /* make cache structure */
  4850:       ncache = g_slice_new (GstPadPushCache);
  4851:       *ncache = scache;
  4852: 
  4853:       pad_put_cache (pad, ncache, cache_ptr);
#32 0x00007fecf5ed0306 in gst_base_transform_sink_eventfunc (trans=0x47966d0, event=0x3a93700) at gstbasetransform.c:1879
  1874:           sink_suggest, sink_suggest, priv->size_suggest);
  1875:     } else {
  1876:       GST_DEBUG_OBJECT (trans,
  1877:           "have suggestion equal to upstream caps %p %" GST_PTR_FORMAT, caps,
  1878:           caps);
  1879:       gst_caps_replace (&sink_suggest, caps);
  1880:       size_suggest = size;
  1881:       suggest = FALSE;
  1882:     }
  1883:     priv->suggest_pending = FALSE;
  1884:     GST_OBJECT_UNLOCK (pad);
#33 0x00007fecf5bf76cb in gst_pad_send_event_unchecked (pad=pad@entry=0x37391e0, event=event@entry=0x3a93700, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) at gstpad.c:5035
  5030:     return GST_FLOW_NOT_NEGOTIATED;
  5031:   }
  5032: }
  5033: 
  5034: /**
  5035:  * gst_pad_get_range:
  5036:  * @pad: a src #GstPad, returns #GST_FLOW_ERROR if not.
  5037:  * @offset: The start offset of the buffer
  5038:  * @size: The length of the buffer
  5039:  * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer,
  5040:  *     returns #GST_FLOW_ERROR if %NULL.
#34 0x00007fecf5bf7eb4 in gst_pad_push_event_unchecked (pad=pad@entry=0x3738d80, event=0x3a93700, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) at gstpad.c:4731
  4726:     GstPadPushCache scache = { NULL, };
  4727: 
  4728:     GST_LOG_OBJECT (pad, "Taking slow path");
  4729: 
  4730:     ret = gst_pad_push_data (pad, TRUE, buffer, &scache);
  4731: 
  4732:     if (scache.peer) {
  4733:       GstPadPushCache *ncache;
  4734: 
  4735:       GST_LOG_OBJECT (pad, "Caching push data");
  4736: 
#35 0x00007fecf5bf8328 in push_sticky (pad=0x3738d80, ev=0x7fecd528e970, user_data=0x7fecd528e9d0) at gstpad.c:3370
  3365: /**
  3366:  * gst_pad_iterate_internal_links:
  3367:  * @pad: the GstPad to get the internal links of.
  3368:  *
  3369:  * Gets an iterator for the pads to which the given pad is linked to inside
  3370:  * of the parent element.
  3371:  *
  3372:  * Each #GstPad element yielded by the iterator will have its refcount increased,
  3373:  * so unref after use.
  3374:  *
  3375:  * Free-function: gst_iterator_free
#36 0x00007fecf5bf6622 in events_foreach (pad=pad@entry=0x3738d80, func=func@entry=0x7fecf5bf81d0 <push_sticky>, user_data=user_data@entry=0x7fecd528e9d0) at gstpad.c:530
  525: /**
  526:  * gst_pad_new:
  527:  * @name: the name of the new pad.
  528:  * @direction: the #GstPadDirection of the pad.
  529:  *
  530:  * Creates a new pad with the given name in the given direction.
  531:  * If name is NULL, a guaranteed unique name (across all pads)
  532:  * will be assigned.
  533:  * This function makes a copy of the name so you can safely free the name.
  534:  *
  535:  * Returns: (transfer full): a new #GstPad, or NULL in case of an error.
#37 0x00007fecf5c005f8 in check_sticky (event=0x3a93700, pad=0x3738d80) at gstpad.c:3426
  3421:  * Deprecated: This function does not ref the pads in the list so that they
  3422:  * could become invalid by the time the application accesses them. It's also
  3423:  * possible that the list changes while handling the pads, which the caller of
  3424:  * this function is unable to know. Use the thread-safe
  3425:  * gst_pad_iterate_internal_links_default() instead.
  3426:  */
  3427: #ifndef GST_REMOVE_DEPRECATED
  3428: GList *
  3429: gst_pad_get_internal_links_default (GstPad * pad)
  3430: {
  3431:   GList *res = NULL;
#38 gst_pad_push_event (pad=0x3738d80, event=event@entry=0x3a93700) at gstpad.c:4848
  4843: 
  4844:     if (scache.peer) {
  4845:       GstPadPushCache *ncache;
  4846: 
  4847:       GST_LOG_OBJECT (pad, "Caching push data");
  4848: 
  4849:       /* make cache structure */
  4850:       ncache = g_slice_new (GstPadPushCache);
  4851:       *ncache = scache;
  4852: 
  4853:       pad_put_cache (pad, ncache, cache_ptr);
#39 0x00007fecf5ed0306 in gst_base_transform_sink_eventfunc (trans=0x38c8be0, event=0x3a93700) at gstbasetransform.c:1879
  1874:           sink_suggest, sink_suggest, priv->size_suggest);
  1875:     } else {
  1876:       GST_DEBUG_OBJECT (trans,
  1877:           "have suggestion equal to upstream caps %p %" GST_PTR_FORMAT, caps,
  1878:           caps);
  1879:       gst_caps_replace (&sink_suggest, caps);
  1880:       size_suggest = size;
  1881:       suggest = FALSE;
  1882:     }
  1883:     priv->suggest_pending = FALSE;
  1884:     GST_OBJECT_UNLOCK (pad);
#40 0x00007fecf5bf76cb in gst_pad_send_event_unchecked (pad=pad@entry=0x3738920, event=event@entry=0x3a93700, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) at gstpad.c:5035
  5030:     return GST_FLOW_NOT_NEGOTIATED;
  5031:   }
  5032: }
  5033: 
  5034: /**
  5035:  * gst_pad_get_range:
  5036:  * @pad: a src #GstPad, returns #GST_FLOW_ERROR if not.
  5037:  * @offset: The start offset of the buffer
  5038:  * @size: The length of the buffer
  5039:  * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer,
  5040:  *     returns #GST_FLOW_ERROR if %NULL.
#41 0x00007fecf5bf7eb4 in gst_pad_push_event_unchecked (pad=pad@entry=0x3738b50, event=0x3a93700, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) at gstpad.c:4731
  4726:     GstPadPushCache scache = { NULL, };
  4727: 
  4728:     GST_LOG_OBJECT (pad, "Taking slow path");
  4729: 
  4730:     ret = gst_pad_push_data (pad, TRUE, buffer, &scache);
  4731: 
  4732:     if (scache.peer) {
  4733:       GstPadPushCache *ncache;
  4734: 
  4735:       GST_LOG_OBJECT (pad, "Caching push data");
  4736: 
#42 0x00007fecf5bf8328 in push_sticky (pad=0x3738b50, ev=0x7fecd528ec50, user_data=0x7fecd528ecb0) at gstpad.c:3370
  3365: /**
  3366:  * gst_pad_iterate_internal_links:
  3367:  * @pad: the GstPad to get the internal links of.
  3368:  *
  3369:  * Gets an iterator for the pads to which the given pad is linked to inside
  3370:  * of the parent element.
  3371:  *
  3372:  * Each #GstPad element yielded by the iterator will have its refcount increased,
  3373:  * so unref after use.
  3374:  *
  3375:  * Free-function: gst_iterator_free
#43 0x00007fecf5bf6622 in events_foreach (pad=pad@entry=0x3738b50, func=func@entry=0x7fecf5bf81d0 <push_sticky>, user_data=user_data@entry=0x7fecd528ecb0) at gstpad.c:530
  525: /**
  526:  * gst_pad_new:
  527:  * @name: the name of the new pad.
  528:  * @direction: the #GstPadDirection of the pad.
  529:  *
  530:  * Creates a new pad with the given name in the given direction.
  531:  * If name is NULL, a guaranteed unique name (across all pads)
  532:  * will be assigned.
  533:  * This function makes a copy of the name so you can safely free the name.
  534:  *
  535:  * Returns: (transfer full): a new #GstPad, or NULL in case of an error.
#44 0x00007fecf5c005f8 in check_sticky (event=0x3a93700, pad=0x3738b50) at gstpad.c:3426
  3421:  * Deprecated: This function does not ref the pads in the list so that they
  3422:  * could become invalid by the time the application accesses them. It's also
  3423:  * possible that the list changes while handling the pads, which the caller of
  3424:  * this function is unable to know. Use the thread-safe
  3425:  * gst_pad_iterate_internal_links_default() instead.
  3426:  */
  3427: #ifndef GST_REMOVE_DEPRECATED
  3428: GList *
  3429: gst_pad_get_internal_links_default (GstPad * pad)
  3430: {
  3431:   GList *res = NULL;
#45 gst_pad_push_event (pad=0x3738b50, event=event@entry=0x3a93700) at gstpad.c:4848
  4843: 
  4844:     if (scache.peer) {
  4845:       GstPadPushCache *ncache;
  4846: 
  4847:       GST_LOG_OBJECT (pad, "Caching push data");
  4848: 
  4849:       /* make cache structure */
  4850:       ncache = g_slice_new (GstPadPushCache);
  4851:       *ncache = scache;
  4852: 
  4853:       pad_put_cache (pad, ncache, cache_ptr);
#46 0x00007fece51fb2c7 in gst_queue_push_one (queue=0x7fec9801b390) at gstqueue.c:1167
  1162:       GST_CAT_LOG_OBJECT (queue_dataflow, queue,
  1163:           "got UNEXPECTED from downstream");
  1164:       /* stop pushing buffers, we dequeue all items until we see an item that we
  1165:        * can push again, which is EOS or NEWSEGMENT. If there is nothing in the
  1166:        * queue we can push, we set a flag to make the sinkpad refuse more
  1167:        * buffers with an UNEXPECTED return value. */
  1168:       while ((data = gst_queue_locked_dequeue (queue, &is_buffer))) {
  1169:         if (is_buffer) {
  1170:           GST_CAT_LOG_OBJECT (queue_dataflow, queue,
  1171:               "dropping UNEXPECTED buffer %p", data);
  1172:           gst_buffer_unref (GST_BUFFER_CAST (data));
#47 gst_queue_loop (pad=<optimized out>) at gstqueue.c:1244
  1239:   /* have to lock for thread-safety */
  1240:   GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
  1241: 
  1242:   while (gst_queue_is_empty (queue)) {
  1243:     GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is empty");
  1244:     if (!queue->silent) {
  1245:       GST_QUEUE_MUTEX_UNLOCK (queue);
  1246:       g_signal_emit (queue, gst_queue_signals[SIGNAL_UNDERRUN], 0);
  1247:       GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
  1248:     }
  1249: 
#48 0x00007fecf5c264e9 in gst_task_func (task=0x39525f0) at gsttask.c:316
  311:         GST_TASK_SIGNAL (task);
  312:         GST_TASK_WAIT (task);
  313:         GST_OBJECT_UNLOCK (task);
  314:         /* locking order.. */
  315:         if (t > 0)
  316:           g_static_rec_mutex_lock_full (lock, t);
  317: 
  318:         GST_OBJECT_LOCK (task);
  319:         if (G_UNLIKELY (GET_TASK_STATE (task) == GST_TASK_STOPPED)) {
  320:           GST_OBJECT_UNLOCK (task);
  321:           goto done;
#49 0x00007fed0866689c in ?? ()
#50 0x0000000000000000 in ?? ()