GitLab

Part-of: <!210>

Part-of: <!198>

and update plugins cache

Part-of: <!182>

Otherwise there is a pretty rare race where we get the
_initialize_stack_func executed leading to the stack set up and
the source pushing buffers before the composition source pad is
activated, and a STREAM_ERROR is reported as we end up pushing a
buffer to a flushing pad.

Thanks rr chaos mode for showing that improbable race

Part-of: <!175>

Part-of: <!175>

The case was that the timeline state was being changed from the parent
composition's action thread before the timeline was committed, leading
to the SELECT_STREAM event to be pushed from the track to the nested
timeline from the wrong composition thread.

```
**
GES:ERROR:../subprojects/gst-editing-services/ges/ges-track.c:1263:ges_track_remove_element: assertion failed: (track->priv->valid_thread == g_thread_self())
Bail out! GES:ERROR:../subprojects/gst-editing-services/ges/ges-track.c:1263:ges_track_remove_element: assertion failed: (track->priv->valid_thread == g_thread_self())

   Thread 1 (Thread 0x7f6ec2d43700 (LWP 1228982)):
   #0  0x00007f6ed85b2a25 in raise () at /lib64/libc.so.6
   #1  0x00007f6ed859b895 in abort () at /lib64/libc.so.6
   #2  0x00007f6ed899cb8c in g_assertion_message (domain=<optimized out>, file=0x7f6ed8d7fd58 "../subprojects/gst-editing-services/ges/ges-track.c", line=<optimized out>, func=<optimized out>, message=<optimized out>) at ../glib/gtestutils.c:2914
   #3  0x00007f6ed89fa9ff in g_assertion_message_expr (domain=domain@entry=0x7f6ed8d76875 "GES", file=file@entry=0x7f6ed8d7fd58 "../subprojects/gst-editing-services/ges/ges-track.c", line=line@entry=1263, func=func@entry=0x7f6ed8d805b0 <__func__.6> "ges_track_remove_element", expr=expr@entry=0x7f6ed8d801e8 "track->priv->valid_thread == g_thread_self()") at ../glib/gtestutils.c:2940
   #4  0x00007f6ed8d2658f in ges_track_remove_element (track=track@entry=0x7f6eb4119b20 [GESAudioTrack], object=object@entry=0x106f240 [GESAudioUriSource]) at ../subprojects/gst-editing-services/ges/ges-track.c:1263
   #5  0x00007f6ed8d10842 in ges_clip_empty_from_track (clip=0x7f6e7803ee80 [GESUriClip], track=track@entry=0x7f6eb4119b20 [GESAudioTrack]) at ../subprojects/gst-editing-services/ges/ges-clip.c:1086
   #6  0x00007f6ed8d01453 in ges_timeline_remove_track (timeline=timeline@entry=0x7f6e6c01ae50 [GESTimeline], track=0x7f6eb4119b20 [GESAudioTrack]) at ../subprojects/gst-editing-services/ges/ges-timeline.c:2460
   #7  0x00007f6ed8d0286b in ges_timeline_send_event (element=<optimized out>, event=<optimized out>) at ../subprojects/gst-editing-services/ges/ges-timeline.c:484
   #8  0x00007f6ed8bf466c in gst_element_send_event (element=0x7f6e6c01ae50 [GESTimeline], event=event@entry=0x7f6eb410f9f0) at ../subprojects/gstreamer/gst/gstelement.c:1934
   #9  0x00007f6ed8d242cd in ges_track_handle_message (bin=0xd846f0 [GESVideoTrack], message=0x7f6eb411ac90) at ../subprojects/gst-editing-services/ges/ges-track.c:477
   #10 0x00007f6ed8bc9128 in bin_bus_handler (bus=<optimized out>, message=<optimized out>, bin=<optimized out>) at ../subprojects/gstreamer/gst/gstbin.c:3286
   #11 0x00007f6ed8bdbae2 in gst_bus_post (bus=bus@entry=0xfdf440 [GstBus], message=message@entry=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstbus.c:359
   #12 0x00007f6ed8bf1396 in gst_element_post_message_default (element=element@entry=0x10261d0 [NleComposition], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2067
   #13 0x00007f6ed8bccbee in gst_bin_post_message (element=0x10261d0 [NleComposition], msg=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstmessage.h:376
   #14 0x00007f6ed8bf4b66 in gst_element_post_message (element=0x10261d0 [NleComposition], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2110
   #15 0x00007f6ed8bc9128 in bin_bus_handler (bus=<optimized out>, message=<optimized out>, bin=<optimized out>) at ../subprojects/gstreamer/gst/gstbin.c:3286
   #16 0x00007f6ed8bdbae2 in gst_bus_post (bus=bus@entry=0xfdf2c0 [GstBus], message=message@entry=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstbus.c:359
   #17 0x00007f6ed8bf1396 in gst_element_post_message_default (element=element@entry=0x1029110 [GstBin], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2067
   #18 0x00007f6ed8bccbee in gst_bin_post_message (element=0x1029110 [GstBin], msg=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstmessage.h:376
   #19 0x00007f6ed8bf4b66 in gst_element_post_message (element=0x1029110 [GstBin], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2110
   #20 0x00007f6ed8bc9128 in bin_bus_handler (bus=<optimized out>, message=<optimized out>, bin=<optimized out>) at ../subprojects/gstreamer/gst/gstbin.c:3286
   #21 0x00007f6ed8bdbae2 in gst_bus_post (bus=bus@entry=0xfdf500 [GstBus], message=message@entry=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstbus.c:359
   #22 0x00007f6ed8bf1396 in gst_element_post_message_default (element=element@entry=0xd705e0 [NleSource], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2067
   #23 0x00007f6ed8bccbee in gst_bin_post_message (element=0xd705e0 [NleSource], msg=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstmessage.h:376
   #24 0x00007f6ed8bf4b66 in gst_element_post_message (element=0xd705e0 [NleSource], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2110
   #25 0x00007f6ed8bc9128 in bin_bus_handler (bus=<optimized out>, message=<optimized out>, bin=<optimized out>) at ../subprojects/gstreamer/gst/gstbin.c:3286
   #26 0x00007f6ed8bdbae2 in gst_bus_post (bus=bus@entry=0x1042400 [GstBus], message=message@entry=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstbus.c:359
   #27 0x00007f6ed8bf1396 in gst_element_post_message_default (element=element@entry=0x1029450 [GstBin], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2067
   #28 0x00007f6ed8bccbee in gst_bin_post_message (element=0x1029450 [GstBin], msg=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstmessage.h:376
   #29 0x00007f6ed8bf4b66 in gst_element_post_message (element=0x1029450 [GstBin], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2110
   #30 0x00007f6ed8bc9128 in bin_bus_handler (bus=<optimized out>, message=<optimized out>, bin=<optimized out>) at ../subprojects/gstreamer/gst/gstbin.c:3286
   #31 0x00007f6ed8bdbae2 in gst_bus_post (bus=bus@entry=0x1042640 [GstBus], message=message@entry=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstbus.c:359
   #32 0x00007f6ed8bf1396 in gst_element_post_message_default (element=element@entry=0x7f6eb42fc7a0 [GstURIDecodeBin], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2067
   #33 0x00007f6ed8bccbee in gst_bin_post_message (element=0x7f6eb42fc7a0 [GstURIDecodeBin], msg=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstmessage.h:376
   #34 0x00007f6ed8bf4b66 in gst_element_post_message (element=0x7f6eb42fc7a0 [GstURIDecodeBin], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2110
   #35 0x00007f6ed8bc9128 in bin_bus_handler (bus=<optimized out>, message=<optimized out>, bin=<optimized out>) at ../subprojects/gstreamer/gst/gstbin.c:3286
   #36 0x00007f6ed8bdbae2 in gst_bus_post (bus=bus@entry=0x7f6eb80a7130 [GstBus], message=message@entry=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstbus.c:359
   #37 0x00007f6ed8bf1396 in gst_element_post_message_default (element=element@entry=0x7f6e6c02aa60 [GstDecodeBin], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2067
   #38 0x00007f6ed8bccbee in gst_bin_post_message (element=0x7f6e6c02aa60 [GstDecodeBin], msg=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstmessage.h:376
   #39 0x00007f6ed8bf4b66 in gst_element_post_message (element=0x7f6e6c02aa60 [GstDecodeBin], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2110
   #40 0x00007f6ec8f1e00d in gst_decode_bin_handle_message (bin=0x7f6e6c02aa60 [GstDecodeBin], msg=<optimized out>) at ../subprojects/gst-plugins-base/gst/playback/gstdecodebin2.c:5667
   #41 0x00007f6ed8bc9128 in bin_bus_handler (bus=<optimized out>, message=<optimized out>, bin=<optimized out>) at ../subprojects/gstreamer/gst/gstbin.c:3286
   #42 0x00007f6ed8bdbae2 in gst_bus_post (bus=bus@entry=0x7f6eb4139110 [GstBus], message=message@entry=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstbus.c:359
   #43 0x00007f6ed8bf1396 in gst_element_post_message_default (element=element@entry=0x7f6e54038c70 [GESDemux], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2067
   #44 0x00007f6ed8bccbee in gst_bin_post_message (element=0x7f6e54038c70 [GESDemux], msg=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstmessage.h:376
   #45 0x00007f6ed8bf4b66 in gst_element_post_message (element=0x7f6e54038c70 [GESDemux], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2110
   #46 0x00007f6ed8bc9128 in bin_bus_handler (bus=<optimized out>, message=<optimized out>, bin=<optimized out>) at ../subprojects/gstreamer/gst/gstbin.c:3286
   #47 0x00007f6ed8bdbae2 in gst_bus_post (bus=bus@entry=0x7f6eb4139350 [GstBus], message=message@entry=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstbus.c:359
   #48 0x00007f6ed8bf1396 in gst_element_post_message_default (element=element@entry=0x7f6e6c01ae50 [GESTimeline], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2067
   #49 0x00007f6ed8bccbee in gst_bin_post_message (element=0x7f6e6c01ae50 [GESTimeline], msg=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstmessage.h:376
   #50 0x00007f6ed8bf4b66 in gst_element_post_message (element=element@entry=0x7f6e6c01ae50 [GESTimeline], message=0x7f6eb411ac90) at ../subprojects/gstreamer/gst/gstelement.c:2110
   #51 0x00007f6ed8cfa221 in ges_timeline_change_state (element=0x7f6e6c01ae50 [GESTimeline], transition=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gst-editing-services/ges/ges-timeline.c:450
   #52 0x00007f6ed8bf5d1e in gst_element_change_state (element=element@entry=0x7f6e6c01ae50 [GESTimeline], transition=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:3033
   #53 0x00007f6ed8bf6868 in gst_element_continue_state (element=element@entry=0x7f6e6c01ae50 [GESTimeline], ret=ret@entry=GST_STATE_CHANGE_SUCCESS) at ../subprojects/gstreamer/gst/gstelement.c:2741
   #54 0x00007f6ed8bf5d67 in gst_element_change_state (element=element@entry=0x7f6e6c01ae50 [GESTimeline], transition=transition@entry=GST_STATE_CHANGE_NULL_TO_READY) at ../subprojects/gstreamer/gst/gstelement.c:3072
   #55 0x00007f6ed8bf6368 in gst_element_set_state_func (element=0x7f6e6c01ae50 [GESTimeline], state=GST_STATE_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:2987
   #56 0x00007f6ed8bd2129 in gst_bin_element_set_state (next=GST_STATE_PAUSED, current=GST_STATE_PAUSED, start_time=0, base_time=0, element=0x7f6e6c01ae50 [GESTimeline], bin=0x7f6e54038c70 [GESDemux]) at ../subprojects/gstreamer/gst/gstbin.c:2615
   #57 gst_bin_change_state_func (element=0x7f6e54038c70 [GESDemux], transition=GST_STATE_CHANGE_PAUSED_TO_PAUSED) at ../subprojects/gstreamer/gst/gstbin.c:2957
   #58 0x00007f6ed8bf5d1e in gst_element_change_state (element=element@entry=0x7f6e54038c70 [GESDemux], transition=transition@entry=GST_STATE_CHANGE_PAUSED_TO_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:3033
   #59 0x00007f6ed8bf6368 in gst_element_set_state_func (element=0x7f6e54038c70 [GESDemux], state=GST_STATE_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:2987
   #60 0x00007f6ed8bd2129 in gst_bin_element_set_state (next=GST_STATE_PAUSED, current=GST_STATE_READY, start_time=0, base_time=0, element=0x7f6e54038c70 [GESDemux], bin=0x7f6e6c02aa60 [GstDecodeBin]) at ../subprojects/gstreamer/gst/gstbin.c:2615
   #61 gst_bin_change_state_func (element=0x7f6e6c02aa60 [GstDecodeBin], transition=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstbin.c:2957
   #62 0x00007f6ec8f1e84f in gst_decode_bin_change_state (element=0x7f6e6c02aa60 [GstDecodeBin], transition=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gst-plugins-base/gst/playback/gstdecodebin2.c:5482
   #63 0x00007f6ed8bf5d1e in gst_element_change_state (element=element@entry=0x7f6e6c02aa60 [GstDecodeBin], transition=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:3033
   #64 0x00007f6ed8bf6868 in gst_element_continue_state (element=element@entry=0x7f6e6c02aa60 [GstDecodeBin], ret=ret@entry=GST_STATE_CHANGE_SUCCESS) at ../subprojects/gstreamer/gst/gstelement.c:2741
   #65 0x00007f6ed8bf5d67 in gst_element_change_state (element=element@entry=0x7f6e6c02aa60 [GstDecodeBin], transition=transition@entry=GST_STATE_CHANGE_NULL_TO_READY) at ../subprojects/gstreamer/gst/gstelement.c:3072
   #66 0x00007f6ed8bf6368 in gst_element_set_state_func (element=0x7f6e6c02aa60 [GstDecodeBin], state=GST_STATE_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:2987
   #67 0x00007f6ed8bf5ae8 in gst_element_sync_state_with_parent (element=0x7f6e6c02aa60 [GstDecodeBin]) at ../subprojects/gstreamer/gst/gstelement.c:2413
   #68 0x00007f6ed89f17a0 in g_slist_foreach (list=<optimized out>, func=0x7f6ed8bf5a50 <gst_element_sync_state_with_parent>, user_data=user_data@entry=0x0) at ../glib/gslist.c:880
   #69 0x00007f6ec8f37d45 in gst_uri_decode_bin_change_state (element=<optimized out>, transition=<optimized out>) at ../subprojects/gst-plugins-base/gst/playback/gsturidecodebin.c:2869
   #70 0x00007f6ed8bf5d1e in gst_element_change_state (element=element@entry=0x7f6eb42fc7a0 [GstURIDecodeBin], transition=transition@entry=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:3033
   #71 0x00007f6ed8bf6368 in gst_element_set_state_func (element=0x7f6eb42fc7a0 [GstURIDecodeBin], state=GST_STATE_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:2987
   #72 0x00007f6ed8bd2129 in gst_bin_element_set_state (next=GST_STATE_PAUSED, current=GST_STATE_READY, start_time=0, base_time=0, element=0x7f6eb42fc7a0 [GstURIDecodeBin], bin=0x1029450 [GstBin]) at ../subprojects/gstreamer/gst/gstbin.c:2615
   #73 gst_bin_change_state_func (element=0x1029450 [GstBin], transition=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstbin.c:2957
   #74 0x00007f6ed8bf5d1e in gst_element_change_state (element=element@entry=0x1029450 [GstBin], transition=transition@entry=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:3033
   #75 0x00007f6ed8bf6368 in gst_element_set_state_func (element=0x1029450 [GstBin], state=GST_STATE_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:2987
   #76 0x00007f6ed8bd2129 in gst_bin_element_set_state (next=GST_STATE_PAUSED, current=GST_STATE_READY, start_time=0, base_time=0, element=0x1029450 [GstBin], bin=0xd705e0 [NleSource]) at ../subprojects/gstreamer/gst/gstbin.c:2615
   #77 gst_bin_change_state_func (element=0xd705e0 [NleSource], transition=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstbin.c:2957
   #78 0x00007f6ec805533f in nle_object_change_state (element=0xd705e0 [NleSource], transition=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gst-editing-services/plugins/nle/nleobject.c:748
   #79 0x00007f6ed8bf5d1e in gst_element_change_state (element=element@entry=0xd705e0 [NleSource], transition=transition@entry=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:3033
   #80 0x00007f6ed8bf6368 in gst_element_set_state_func (element=0xd705e0 [NleSource], state=GST_STATE_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:2987
   #81 0x00007f6ed8bd2129 in gst_bin_element_set_state (next=GST_STATE_PAUSED, current=GST_STATE_READY, start_time=0, base_time=0, element=0xd705e0 [NleSource], bin=0x1029110 [GstBin]) at ../subprojects/gstreamer/gst/gstbin.c:2615
   #82 gst_bin_change_state_func (element=0x1029110 [GstBin], transition=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstbin.c:2957
   #83 0x00007f6ed8bf5d1e in gst_element_change_state (element=element@entry=0x1029110 [GstBin], transition=transition@entry=GST_STATE_CHANGE_READY_TO_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:3033
   #84 0x00007f6ed8bf6368 in gst_element_set_state_func (element=0x1029110 [GstBin], state=GST_STATE_PAUSED) at ../subprojects/gstreamer/gst/gstelement.c:2987
   #85 0x00007f6ed8bf5ae8 in gst_element_sync_state_with_parent (element=0x1029110 [GstBin]) at ../subprojects/gstreamer/gst/gstelement.c:2413
   #86 0x00007f6ec8060356 in _activate_new_stack (toplevel_seek=<optimized out>, comp=0x10261d0 [NleComposition]) at ../subprojects/gst-editing-services/plugins/nle/nlecomposition.c:3117
   #87 update_pipeline (comp=comp@entry=0x10261d0 [NleComposition], currenttime=<optimized out>, seqnum=<optimized out>, update_reason=update_reason@entry=COMP_UPDATE_STACK_INITIALIZE) at ../subprojects/gst-editing-services/plugins/nle/nlecomposition.c:3396
   #88 0x00007f6ec80614f6 in _initialize_stack_func (comp=0x10261d0 [NleComposition], ucompo=0x108c800) at ../subprojects/gst-editing-services/plugins/nle/nlecomposition.c:732
   #89 0x00007f6ed893788a in g_closure_invoke (closure=<optimized out>, return_value=<optimized out>, n_param_values=<optimized out>, param_values=<optimized out>, invocation_hint=<optimized out>) at ../gobject/gclosure.c:810
   #90 0x00007f6ec805aaf6 in _execute_actions (comp=0x10261d0 [NleComposition]) at ../subprojects/gst-editing-services/plugins/nle/nlecomposition.c:412
   #91 0x00007f6ed8c4c1cf in gst_task_func (task=0x7f6e6c01c290 [GstTask]) at ../subprojects/gstreamer/gst/gsttask.c:328
   #92 0x00007f6ed89fc0f4 in g_thread_pool_thread_proxy (data=<optimized out>) at ../glib/gthreadpool.c:354
   #93 0x00007f6ed89fb7f2 in g_thread_proxy (data=0x7f6eb0017800) at ../glib/gthread.c:807
   #94 0x00007f6ed7e14432 in start_thread () at /lib64/libpthread.so.0
   #95 0x00007f6ed86779d3 in clone () at /lib64/libc.so.6
```

Part-of: <!167>

The property had been deprecated and is unused.

This property is not needed. Any internal time effect that an nleoperation
wraps is itself responsible for converting seek/segment timestamps.
Previously, the ghostpads were performing a rate conversion after the
rate element had already done so, essentially doubling their effect on
seeks and segment times. This was always unnecessary, but went unnoticed
by the tempochange test because it was using an identity element rather
than an actual rate-changing element.

Part-of: <!160>

This property was unused.

Part-of: <!160>

And add some tests

Part-of: <!166>

CID: 1461278

CID: 1455489, 1455521

Making coverity happy

CIDs: 1461460, 1461461, 1461462, 1461463, 1461464, 1461465, 1461466, 1461468,

Instead of doing it at the time of resetting `object->in_composition`
when user calls `gst_bin_remove` do it after we actually removed
it from the object thread, and do it in the `nle_object_reset`
method where it belongs

Fixes #96

nleobject.duration defaults to 0, but this is pretty unintuitive for
end user in the case nlesource is use standalone, just consider
duration=0 equivalent to duration=GST_CLOCK_TIME_NONE as it makes
the element much simpler to use, we could actually forbid 0 as a value
in the future.

Also take into account potential CLOCK_TIME_NONE

Basically the tags we send before STREAM_START are now ignored, meaning
that we could not detect nested timelines anymore, this commits makes
sure that we send our tag event after getting pushing STREAM_START.

When a composition is nested into anotherone, we *know* that the
toplevel composition is going to send a stack initializing seek,
we can thus avoid sending it on the subcomposition itself when
prerolling. This avoid seeking roundtrips and we now have one and
only one seek travelling in the overall pipeline (after it has
prerolled).

The 'start' of nleobject is in the 'composition' scale, inpoint is in
the media scale, when outside a composition, a nleobject->start value
doesn't mean anything.

Instead of seeking each nleobject separately to setup new stack, wait
for the whole stack to preroll and then seek that newly setup stack,
leading to the same code path and seek 'tweaking' as when processing
a seek on the composition (without stack changes).

This is mandatory to properly handle filter that tweak segments to handle
time remapping for example.

By passing NULL to `g_signal_new` instead of a marshaller, GLib will
actually internally optimize the signal (if the marshaller is available
in GLib itself) by also setting the valist marshaller. This makes the
signal emission a bit more performant than the regular marshalling,
which still needs to box into `GValue` and call libffi in case of a
generic marshaller.

Note that for custom marshallers, one would use
`g_signal_set_va_marshaller()` with the valist marshaller instead.

Todo:
 - hook up data/completions/ges-launch-1.0 in Meson (#77)

Prevents critical warnings during class_init()

../plugins/ges/gesdemux.c:50:1: error: unused function 'glib_autoptr_cleanup_GESDemux' [-Werror,-Wunused-function]
G_DECLARE_FINAL_TYPE (GESDemux, ges_demux, GES, DEMUX, GESBaseBin);
^
/home/matt/Projects/cerbero/build/dist/android_universal/x86_64/include/glib-2.0/gobject/gtype.h:1401:3: note: expanded from macro 'G_DECLARE_FINAL_TYPE'
  _GLIB_DEFINE_AUTOPTR_CHAINUP (ModuleObjName, ParentName)                                               \
  ^
/home/matt/Projects/cerbero/build/dist/android_universal/x86_64/include/glib-2.0/glib/gmacros.h:451:22: note: expanded from macro '_GLIB_DEFINE_AUTOPTR_CHAINUP'
  static inline void _GLIB_AUTOPTR_FUNC_NAME(ModuleObjName) (ModuleObjName **_ptr) {                     \
                     ^
/home/matt/Projects/cerbero/build/dist/android_universal/x86_64/include/glib-2.0/glib/gmacros.h:441:43: note: expanded from macro '_GLIB_AUTOPTR_FUNC_NAME'
#define _GLIB_AUTOPTR_FUNC_NAME(TypeName) glib_autoptr_cleanup_##TypeName
                                          ^
<scratch space>:81:1: note: expanded from here
glib_autoptr_cleanup_GESDemux
^

../plugins/ges/gessrc.c:56:1: error: unused function 'glib_autoptr_cleanup_GESSrc' [-Werror,-Wunused-function]
G_DECLARE_FINAL_TYPE (GESSrc, ges_src, GES, SRC, GESBaseBin);
^
/home/matt/Projects/cerbero/build/dist/android_universal/x86_64/include/glib-2.0/gobject/gtype.h:1401:3: note: expanded from macro 'G_DECLARE_FINAL_TYPE'
  _GLIB_DEFINE_AUTOPTR_CHAINUP (ModuleObjName, ParentName)                                               \
  ^
/home/matt/Projects/cerbero/build/dist/android_universal/x86_64/include/glib-2.0/glib/gmacros.h:451:22: note: expanded from macro '_GLIB_DEFINE_AUTOPTR_CHAINUP'
  static inline void _GLIB_AUTOPTR_FUNC_NAME(ModuleObjName) (ModuleObjName **_ptr) {                     \
                     ^
/home/matt/Projects/cerbero/build/dist/android_universal/x86_64/include/glib-2.0/glib/gmacros.h:441:43: note: expanded from macro '_GLIB_AUTOPTR_FUNC_NAME'
#define _GLIB_AUTOPTR_FUNC_NAME(TypeName) glib_autoptr_cleanup_##TypeName
                                          ^
<scratch space>:158:1: note: expanded from here
glib_autoptr_cleanup_GESSrc
^

Also fix wrong casing the `G_DECLARE` for GESDemux.

../subprojects/gst-editing-services/plugins/ges/gessrc.c:56:1: warning: unused function 'GES_SRC' [-Wunused-function]
G_DECLARE_FINAL_TYPE (GESSrc, ges_src, GES, SRC, GESBaseBin);
^
/usr/include/glib-2.0/gobject/gtype.h:1405:33: note: expanded from macro 'G_DECLARE_FINAL_TYPE'
static inline ModuleObjName * MODULE##_##OBJ_NAME (gpointer ptr) {                                     \
                              ^
<scratch space>:39:1: note: expanded from here
GES_SRC
^
../subprojects/gst-editing-services/plugins/ges/gessrc.c:56:1: warning: unused function 'GES_IS_SRC' [-Wunused-function]
/usr/include/glib-2.0/gobject/gtype.h:1407:26: note: expanded from macro 'G_DECLARE_FINAL_TYPE'
static inline gboolean MODULE##_IS_##OBJ_NAME (gpointer ptr) {                                         \
                        ^
<scratch space>:42:1: note: expanded from here
GES_IS_SRC
^

../subprojects/gst-editing-services/plugins/ges/gesdemux.c:50:1: warning: unused function 'GES_Demux' [-Wunused-function]
G_DECLARE_FINAL_TYPE (GESDemux, ges_demux, GES, Demux, GESBaseBin);
^
/usr/include/glib-2.0/gobject/gtype.h:1405:33: note: expanded from macro 'G_DECLARE_FINAL_TYPE'
static inline ModuleObjName * MODULE##_##OBJ_NAME (gpointer ptr) {                                     \
                              ^
<scratch space>:72:1: note: expanded from here
GES_Demux
^
../subprojects/gst-editing-services/plugins/ges/gesdemux.c:50:1: warning: unused function 'GES_IS_Demux' [-Wunused-function]
/usr/include/glib-2.0/gobject/gtype.h:1407:26: note: expanded from macro 'G_DECLARE_FINAL_TYPE'
static inline gboolean MODULE##_IS_##OBJ_NAME (gpointer ptr) {                                         \
                        ^
<scratch space>:75:1: note: expanded from here
GES_IS_Demux
^

We are probing upstream queries, not downstream ones

This was clearly a small test that slipt into previous commit

Implement lazy loading asset cache so gesdemux use the formatters
assets while GES hasn't been initialized.

And set extensions to temporary files as some formatters require
the information (otio)

Adding a property to let the application know

Also make sure that the duration of nested timeline assets is reported
as CLOCK_TIME_NONE as those are extended as necessary.

And make a difference between asset duration and their max duration
As nested timelines can be extended 'infinitely' those max duration
is GST_CLOCK_TIME_NONE, but their duration is the real duration of
the timeline.

And add a "loading-error" signal in GESProject so we can report
issue when loading async elements for the timeline.

When we have nested timelines, we need to make sure the underlying
formatted file is reloaded when commiting the main composition to
take into account the new timeline.

In other to make the implementation as simple as possible we make
sure that whenever the toplevel composition is commited, the decodebin
holding the gesdemux is torn down so that a new demuxer is created
with the new content of the timeline.

To do that a we do a NleCompositionQueryNeedsTearDown query to which
gesdemux answers leading to a full nlecomposition stack
deactivation/activation cycle.

And error out when it is the case.

Make sure that an event resulting from the seek happens before removing
the pad probe, dropping anything while it is not the case.

This guarantees that the seek happens before `nlesource` outputs
anything. This was not necessary as with decodebin or usual source
flushing seeks lead to synchronous flush_start/flush_stop and we could
safely assume that once the seek is sent, it was happenning.
With nested `nlecomposition` this assumption is simply not true as
in the composition seeks are basically cached and happen later in
the composition updating thread.

This fixes races where we ended up removing the blocking probe before
the seek actually started to be executed in the nlecomposition
nested inside an nlesource which leaded to data from *before* the seek
to be outputed which means we could display wrong frames,
and it was leading to interesting deadlocks.