Even in the case where we are not in passthrough but the subclasses are
going to run the allocation query, we need to ensure that we have a
GLContext ready to be used. Otherwise we might end up with assertions
with `gloverlaycompositor` like:
```
#0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=140285688829504) at ./nptl/pthread_kill.c:44
#1 __pthread_kill_internal (signo=6, threadid=140285688829504) at ./nptl/pthread_kill.c:78
#2 __GI___pthread_kill (threadid=140285688829504, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3 0x00007f985ed88476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4 0x00007f985ed6e7f3 in __GI_abort () at ./stdlib/abort.c:79
#5 0x00007f985faedb57 in g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x7f9856251b80 <__func__.5> "gst_gl_buffer_pool_set_config", message=<optimized out>) at ../../../glib/gtestutils.c:3253
#6 0x00007f985fb4770f in g_assertion_message_expr (domain=0x7f9856251883 "GStreamer-GL", file=0x7f9856251820 "../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbufferpool.c", line=132, func=0x7f9856251b80 <__func__.5> "gst_gl_buffer_pool_set_config", expr=<optimized out>) at ../../../glib/gtestutils.c:3279
#7 0x00007f9856200e1f in gst_gl_buffer_pool_set_config (pool=0x7f977009d7e0, config=0x7f9704549050) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbufferpool.c:132
#8 0x00007f985f99bcf7 in gst_buffer_pool_set_config (pool=0x7f977009d7e0, config=0x7f9704549050) at ../subprojects/gstreamer/gst/gstbufferpool.c:698
#9 0x00007f985620e2be in gst_gl_filter_propose_allocation (trans=0x7f9754014a80, decide_query=0x0, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglfilter.c:834
#10 0x00007f98562b43c5 in gst_gl_overlay_compositor_element_propose_allocation (trans=0x7f9754014a80, decide_query=0x0, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/ext/gl/gstgloverlaycompositorelement.c:188
#11 0x00007f985f8e9ea8 in gst_base_transform_default_query (trans=0x7f9754014a80, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1537
#12 0x00007f98561eed91 in gst_gl_base_filter_query (trans=0x7f9754014a80, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:319
#13 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f977c07c7e0, parent=0x7f9754014a80, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#14 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f977c07c7e0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#15 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f977c07c340, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#16 0x00007f985f8e9817 in gst_base_transform_default_propose_allocation (trans=0x7f975401e2b0, decide_query=0x0, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1394
#17 0x00007f985f8e9ea8 in gst_base_transform_default_query (trans=0x7f975401e2b0, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1537
#18 0x00007f98561eed91 in gst_gl_base_filter_query (trans=0x7f975401e2b0, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:319
#19 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f96e420b0c0, parent=0x7f975401e2b0, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#20 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f96e420b0c0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#21 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a0bf0f0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#22 0x00007f985f8e9817 in gst_base_transform_default_propose_allocation (trans=0x7f982a128790, decide_query=0x0, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1394
#23 0x00007f9856289017 in _gst_gl_upload_element_propose_allocation (bt=0x7f982a128790, decide_query=0x0, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/ext/gl/gstgluploadelement.c:239
#24 0x00007f985f8e9ea8 in gst_base_transform_default_query (trans=0x7f982a128790, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1537
#25 0x00007f98561eed91 in gst_gl_base_filter_query (trans=0x7f982a128790, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:319
#26 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f96e405b630, parent=0x7f982a128790, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#27 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f96e405b630, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#28 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f9730289670, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#29 0x00007f985f9f0cb3 in query_forward_func (pad=0x7f9730289670, data=0x7f96cea60000) at ../subprojects/gstreamer/gst/gstpad.c:3458
#30 0x00007f985f9ef9ac in gst_pad_forward (pad=0x7f98280f5d00, forward=0x7f985f9f0b90 <query_forward_func>, user_data=0x7f96cea60000) at ../subprojects/gstreamer/gst/gstpad.c:3084
#31 0x00007f985f9f0ed1 in gst_pad_query_default (pad=0x7f98280f5d00, parent=0x7f98280cc540, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:3529
#32 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f98280f5d00, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#33 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f978438b680, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#34 0x00007f985f9f0cb3 in query_forward_func (pad=0x7f978438b680, data=0x7f96cea60290) at ../subprojects/gstreamer/gst/gstpad.c:3458
#35 0x00007f985f9ef9ac in gst_pad_forward (pad=0x7f98280f5a10, forward=0x7f985f9f0b90 <query_forward_func>, user_data=0x7f96cea60290) at ../subprojects/gstreamer/gst/gstpad.c:3084
#36 0x00007f985f9f0ed1 in gst_pad_query_default (pad=0x7f98280f5a10, parent=0x7f97ec0147f0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:3529
#37 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f98280f5a10, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#38 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f9784831a70, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#39 0x00007f985f9f0cb3 in query_forward_func (pad=0x7f9784831a70, data=0x7f96cea60520) at ../subprojects/gstreamer/gst/gstpad.c:3458
#40 0x00007f985f9ef9ac in gst_pad_forward (pad=0x7f9770081da0, forward=0x7f985f9f0b90 <query_forward_func>, user_data=0x7f96cea60520) at ../subprojects/gstreamer/gst/gstpad.c:3084
#41 0x00007f985f9f0ed1 in gst_pad_query_default (pad=0x7f9770081da0, parent=0x7f983c14e330, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:3529
#42 0x00007f9812258e5c in ghostpad_query_function (ghostpad=0x7f9770081da0, parent=0x7f983c14e330, query=0x7f97040310a0) at ../subprojects/gst-editing-services/plugins/nle/nleghostpad.c:568
#43 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f9770081da0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#44 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2713e0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#45 0x00007f985f9f0cb3 in query_forward_func (pad=0x7f982a2713e0, data=0x7f96cea60800) at ../subprojects/gstreamer/gst/gstpad.c:3458
#46 0x00007f985f9ef9ac in gst_pad_forward (pad=0x7f982a2800c0, forward=0x7f985f9f0b90 <query_forward_func>, user_data=0x7f96cea60800) at ../subprojects/gstreamer/gst/gstpad.c:3084
#47 0x00007f985f9f0ed1 in gst_pad_query_default (pad=0x7f982a2800c0, parent=0x7f982a2713e0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:3529
#48 0x00007f9812258a94 in internalpad_query_function (internal=0x7f982a2800c0, parent=0x7f982a2713e0, query=0x7f97040310a0) at ../subprojects/gst-editing-services/plugins/nle/nleghostpad.c:460
#49 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2800c0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#50 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2f4c80, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#51 0x00007f985f9f0cb3 in query_forward_func (pad=0x7f982a2f4c80, data=0x7f96cea60ae0) at ../subprojects/gstreamer/gst/gstpad.c:3458
#52 0x00007f985f9ef9ac in gst_pad_forward (pad=0x7f982a2dfb00, forward=0x7f985f9f0b90 <query_forward_func>, user_data=0x7f96cea60ae0) at ../subprojects/gstreamer/gst/gstpad.c:3084
#53 0x00007f985f9f0ed1 in gst_pad_query_default (pad=0x7f982a2dfb00, parent=0x7f982a2f4c80, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:3529
#54 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2dfb00, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#55 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2fbc10, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#56 0x00007f985f8e9817 in gst_base_transform_default_propose_allocation (trans=0x7f982a2e87d0, decide_query=0x0, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1394
#57 0x00007f985f8e9ea8 in gst_base_transform_default_query (trans=0x7f982a2e87d0, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1537
#58 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2fb9c0, parent=0x7f982a2e87d0, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#59 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2fb9c0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#60 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2fb770, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#61 0x00007f985f8e9817 in gst_base_transform_default_propose_allocation (trans=0x7f982a302780, decide_query=0x0, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1394
#62 0x00007f985c008d9d in gst_video_rate_propose_allocation (trans=0x7f982a302780, decide_query=0x0, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/gst/videorate/gstvideorate.c:1365
#63 0x00007f985f8e9ea8 in gst_base_transform_default_query (trans=0x7f982a302780, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1537
#64 0x00007f985c008cc5 in gst_video_rate_query (trans=0x7f982a302780, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/gst/videorate/gstvideorate.c:1347
#65 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2fb520, parent=0x7f982a302780, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#66 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2fb520, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#67 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2889c0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#68 0x00007f98122048e6 in gst_base_auto_convert_internal_sink_query (pad=0x7f9750046af0, parent=0x0, query=0x7f97040310a0) at ../subprojects/gst-plugins-bad/gst/autoconvert/gstbaseautoconvert.c:1381
#69 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f9750046af0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#70 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2c13e0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#71 0x00007f985f9f0cb3 in query_forward_func (pad=0x7f982a2c13e0, data=0x7f96cea61680) at ../subprojects/gstreamer/gst/gstpad.c:3458
#72 0x00007f985f9ef9ac in gst_pad_forward (pad=0x7f982a2de340, forward=0x7f985f9f0b90 <query_forward_func>, user_data=0x7f96cea61680) at ../subprojects/gstreamer/gst/gstpad.c:3084
#73 0x00007f985f9f0ed1 in gst_pad_query_default (pad=0x7f982a2de340, parent=0x7f982a2c13e0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:3529
#74 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2de340, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#75 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2db760, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#76 0x00007f98561eebd1 in gst_gl_base_filter_query (trans=0x7f982a2d8df0, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:285
#77 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2db510, parent=0x7f982a2d8df0, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#78 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2db510, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#79 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2db2c0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#80 0x00007f98561eebd1 in gst_gl_base_filter_query (trans=0x7f982a2dc3d0, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:285
#81 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2db070, parent=0x7f982a2dc3d0, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#82 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2db070, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#83 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2dae20, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#84 0x00007f98561eebd1 in gst_gl_base_filter_query (trans=0x7f982a2d8a60, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:285
#85 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2dabd0, parent=0x7f982a2d8a60, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#86 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2dabd0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#87 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2c1170, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#88 0x00007f985f9f0cb3 in query_forward_func (pad=0x7f982a2c1170, data=0x7f96cea62060) at ../subprojects/gstreamer/gst/gstpad.c:3458
#89 0x00007f985f9ef9ac in gst_pad_forward (pad=0x7f982a2de0e0, forward=0x7f985f9f0b90 <query_forward_func>, user_data=0x7f96cea62060) at ../subprojects/gstreamer/gst/gstpad.c:3084
#90 0x00007f985f9f0ed1 in gst_pad_query_default (pad=0x7f982a2de0e0, parent=0x7f982a2c1170, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:3529
#91 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2de0e0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#92 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2da980, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#93 0x00007f985f8e9817 in gst_base_transform_default_propose_allocation (trans=0x7f982a2c8c10, decide_query=0x0, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1394
#94 0x00007f985f8e9ea8 in gst_base_transform_default_query (trans=0x7f982a2c8c10, direction=GST_PAD_SINK, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1537
#95 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2da730, parent=0x7f982a2c8c10, query=0x7f97040310a0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#96 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2da730, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4202
#97 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2da4e0, query=0x7f97040310a0) at ../subprojects/gstreamer/gst/gstpad.c:4334
#98 0x00007f985f8e7ff9 in gst_base_transform_do_bufferpool (trans=0x7f982a2d1a50, outcaps=0x7f970407aac0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:948
#99 0x00007f985f8e963e in gst_base_transform_setcaps (trans=0x7f982a2d1a50, pad=0x7f982a2da290, incaps=0x7f970407aac0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1351
#100 0x00007f985f8e99c8 in gst_base_transform_reconfigure_unlocked (trans=0x7f982a2d1a50) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1431
#101 0x00007f985f8e9d38 in gst_base_transform_default_query (trans=0x7f982a2d1a50, direction=GST_PAD_SINK, query=0x7f9704541620) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1515
#102 0x00007f98561eed91 in gst_gl_base_filter_query (trans=0x7f982a2d1a50, direction=GST_PAD_SINK, query=0x7f9704541620) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:319
#103 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2da290, parent=0x7f982a2d1a50, query=0x7f9704541620) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#104 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2da290, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4202
#105 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2da040, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4334
#106 0x00007f985f8e9817 in gst_base_transform_default_propose_allocation (trans=0x7f982a2c88d0, decide_query=0x0, query=0x7f9704541620) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1394
#107 0x00007f985f8e9ea8 in gst_base_transform_default_query (trans=0x7f982a2c88d0, direction=GST_PAD_SINK, query=0x7f9704541620) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1537
#108 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2d7d30, parent=0x7f982a2c88d0, query=0x7f9704541620) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#109 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2d7d30, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4202
#110 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2b7d40, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4334
#111 0x00007f985f9f0cb3 in query_forward_func (pad=0x7f982a2b7d40, data=0x7f96cea62cb0) at ../subprojects/gstreamer/gst/gstpad.c:3458
#112 0x00007f985f9ef9ac in gst_pad_forward (pad=0x7f982a2c0f00, forward=0x7f985f9f0b90 <query_forward_func>, user_data=0x7f96cea62cb0) at ../subprojects/gstreamer/gst/gstpad.c:3084
#113 0x00007f985f9f0ed1 in gst_pad_query_default (pad=0x7f982a2c0f00, parent=0x7f982a2ba620, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:3529
#114 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2c0f00, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4202
#115 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2d7ae0, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4334
#116 0x00007f98561eebd1 in gst_gl_base_filter_query (trans=0x7f982a2d86d0, direction=GST_PAD_SINK, query=0x7f9704541620) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:285
#117 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2d7890, parent=0x7f982a2d86d0, query=0x7f9704541620) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#118 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2d7890, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4202
#119 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2d7640, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4334
#120 0x00007f98561eebd1 in gst_gl_base_filter_query (trans=0x7f982a2d5b00, direction=GST_PAD_SINK, query=0x7f9704541620) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:285
#121 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2d73f0, parent=0x7f982a2d5b00, query=0x7f9704541620) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#122 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2d73f0, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4202
#123 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2d71a0, query=0x7f9704541620) at ../subprojects/gstreamer/gst/gstpad.c:4334
#124 0x00007f985f8e7ff9 in gst_base_transform_do_bufferpool (trans=0x7f982a2d8340, outcaps=0x7f9704004e30) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:948
#125 0x00007f985f8e963e in gst_base_transform_setcaps (trans=0x7f982a2d8340, pad=0x7f982a2d6f50, incaps=0x7f9704002120) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1351
#126 0x00007f985f8e99c8 in gst_base_transform_reconfigure_unlocked (trans=0x7f982a2d8340) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1431
#127 0x00007f985f8e9d38 in gst_base_transform_default_query (trans=0x7f982a2d8340, direction=GST_PAD_SINK, query=0x7f97045afe90) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1515
#128 0x00007f98561eed91 in gst_gl_base_filter_query (trans=0x7f982a2d8340, direction=GST_PAD_SINK, query=0x7f97045afe90) at ../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglbasefilter.c:319
#129 0x00007f985f8ea223 in gst_base_transform_query (pad=0x7f982a2d6f50, parent=0x7f982a2d8340, query=0x7f97045afe90) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1628
#130 0x00007f985f9f2f77 in gst_pad_query (pad=0x7f982a2d6f50, query=0x7f97045afe90) at ../subprojects/gstreamer/gst/gstpad.c:4202
#131 0x00007f985f9f3aa2 in gst_pad_peer_query (pad=0x7f982a2d6d00, query=0x7f97045afe90) at ../subprojects/gstreamer/gst/gstpad.c:4334
#132 0x00007f985f8e7ff9 in gst_base_transform_do_bufferpool (trans=0x7f982a2d4920, outcaps=0x7f9704071fb0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:948
#133 0x00007f985f8e963e in gst_base_transform_setcaps (trans=0x7f982a2d4920, pad=0x7f982a2d6ab0, incaps=0x7f97500020c0) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1351
#134 0x00007f985f8e99c8 in gst_base_transform_reconfigure_unlocked (trans=0x7f982a2d4920) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:1431
#135 0x00007f985f8eb797 in default_submit_input_buffer (trans=0x7f982a2d4920, is_discont=0, inbuf=0x7f972c009b70) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:2041
#136 0x00007f985f8ecb28 in gst_base_transform_chain (pad=0x7f982a2d6ab0, parent=0x7f982a2d4920, buffer=0x7f972c009b70) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:2348
#137 0x00007f985f9f47c2 in gst_pad_chain_data_unchecked (pad=0x7f982a2d6ab0, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4463
#138 0x00007f985f9f5a15 in gst_pad_push_data (pad=0x7f982a2d6860, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4739
#139 0x00007f985f9f61cc in gst_pad_push (pad=0x7f982a2d6860, buffer=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4858
#140 0x00007f985f8ecd2e in gst_base_transform_chain (pad=0x7f982a2d6610, parent=0x7f982a2c8590, buffer=0x7f972c009b70) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:2391
#141 0x00007f985f9f47c2 in gst_pad_chain_data_unchecked (pad=0x7f982a2d6610, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4463
#142 0x00007f985f9f5a15 in gst_pad_push_data (pad=0x7f982a2de5a0, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4739
#143 0x00007f985f9f61cc in gst_pad_push (pad=0x7f982a2de5a0, buffer=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4858
#144 0x00007f985f9ce428 in gst_proxy_pad_chain_default (pad=0x7f982a2c1650, parent=0x7f982a290880, buffer=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstghostpad.c:127
#145 0x00007f985f9f47c2 in gst_pad_chain_data_unchecked (pad=0x7f982a2c1650, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4463
#146 0x00007f985f9f5a15 in gst_pad_push_data (pad=0x7f97500468a0, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4739
#147 0x00007f985f9f61cc in gst_pad_push (pad=0x7f97500468a0, buffer=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4858
#148 0x00007f9812203aa4 in gst_base_auto_convert_sink_chain (pad=0x7f982a288770, parent=0x7f982a22fbd0, buffer=0x7f972c009b70) at ../subprojects/gst-plugins-bad/gst/autoconvert/gstbaseautoconvert.c:1032
#149 0x00007f985f9f47c2 in gst_pad_chain_data_unchecked (pad=0x7f982a288770, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4463
#150 0x00007f985f9f5a15 in gst_pad_push_data (pad=0x7f982a288520, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4739
#151 0x00007f985f9f61cc in gst_pad_push (pad=0x7f982a288520, buffer=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4858
#152 0x00007f985f8ecd2e in gst_base_transform_chain (pad=0x7f982a2882d0, parent=0x7f982a274570, buffer=0x7f972c009b70) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:2391
#153 0x00007f985f9f47c2 in gst_pad_chain_data_unchecked (pad=0x7f982a2882d0, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4463
#154 0x00007f985f9f5a15 in gst_pad_push_data (pad=0x7f982a288080, type=4112, data=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4739
#155 0x00007f985f9f61cc in gst_pad_push (pad=0x7f982a288080, buffer=0x7f972c009b70) at ../subprojects/gstreamer/gst/gstpad.c:4858
#156 0x00007f982499b9f9 in gst_queue_push_one (queue=0x7f9829d61910) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1388
#157 0x00007f982499c88d in gst_queue_loop (pad=0x7f982a288080) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1541
#158 0x00007f985fa376bb in gst_task_func (task=0x7f976002eb90) at ../subprojects/gstreamer/gst/gsttask.c:399
#159 0x00007f985fa38bf9 in default_func (tdata=0x7f975400c160, pool=0x7f984cb62380) at ../subprojects/gstreamer/gst/gsttaskpool.c:70
#160 0x00007f985fb566b4 in g_thread_pool_thread_proxy (data=<optimized out>) at ../../../glib/gthreadpool.c:350
#161 0x00007f985fb53a51 in g_thread_proxy (data=0x7f982a071580) at ../../../glib/gthread.c:827
#162 0x00007f985eddaac3 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#163 0x00007f985ee6ca40 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
```
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5856>
When overlay coordinates are updated, after the initial coordinates
are set, the shader indices are applied to the wrong buffer, resulting
in the background image appearing where the overlay should.
Bind the array buffer before applying subsequent coordinate
updates.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5901>
In `parse_chain_output_probe()` the corresponding input stream might receive EOS
and thus be removed before the actual pad is removed. So we cannot assert about
this in `parsebin_pad_removed_cb()`.
Also, driving-by, protect `find_input_stream_for_pad()` with the selection lock
similarly to other functions accessing the input streams list.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5887>
This causes a lot of nasty side effects (like decoders assuming they are
actually linked downstream).
The reason why this was done was to check whether a decoder could handle the
actual caps, but this is the wrong way to do it.
The proper way to query whether a decoder can handle certain caps is via
`GST_QUERY_ACCEPT_CAPS` which is already done just before.
Partially reverts !4677 and partially fixes#3160
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5821>
This allows metas to be serialized to be transmitted or stored. This is
intended to be used for example by gdppay or unixfdsink.
Implemented on GstCustomMeta, GstVideoMeta, GstReferenceTimestampMeta,
and GstAudioMeta.
Sponsored-by: Netflix Inc.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5355>
Otherwise if there is a huge gap it will only be considered a
discontinuity after another discont-time amount of buffers has passed.
Like this it will be immediately a discontinuity if the gap between the
expected and received time becomes bigger than the discont-time.
The last part of the test was actually testing for this behaviour and
expected the previous behaviour. Most other tests also had to be
adjusted because discont will now happen at slightly different times
than before.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5759>
Windows does not support fork() so all tests will run in a single
process, and global variables will be reused across multiple tests.
Thus, each test should reset global variables.
Also, setup pad chain/event functions before playing state
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5752>
Whenever that caps changes does not imply that a new segment will start.
Don't reset the last_ts if only the caps have changed. This fixes issues
if you have a stream without only first frame with TS=0, and have resolution
change happening. This was a regression introduced by !3059, which issue was
described in #1352. The reported issue is still fix after this change.
Fixes#1034
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5687>
The fake video decoder ignores input bitstream except
to enforce caps restrictions. It reads video width,
height and framerate from caps. Then it just pushes
video frames without doing any decoding.
The fake video decoder just draws a snake moving from
left to right in the middle of the frame. This is a
light weight drawing while it still provides an idea
about how smooth is the rendering.
The fake video decoder inherits from GstVideoDecoder.
It is useful to measure how smooth will be the whole
rendering pipeline if you had the most efficient video
decoder. Also useful to bisect issues for example when
suspecting issues in a specific video decoder.
Handles mpeg2, mpeg4, h263, h264, theora, vp8, wmv3, msmpeg,
flash-video, vp6, vp9, wmv1, wmv2, divx but more can be
added if needed.
For now it can only output RGBA, RGBx, BGRA, BGRx.
Its rank is 0 (none) but I added a property to change it so
that it can be selected by decodebin.
gst-launch-1.0 fakevideodec rank=512 \
playbin uri=http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4http://bugzilla.gnome.org/show_bug.cgi?id=723778Closes#679
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5636>
From a multimedia perspective GLES >= 2 has the big advantage of
supporting external textures (`OES_EGL_image_external` /
`OES_EGL_image_external_essl3`), allowing various YUV formats to be
imported directly by drivers.
It appears unlikely by now that the extension will ever be ported to
GL with Vulkan becoming more popular, leaving GL without an "official"
way to import YUV formats.
Further more, for Gst internal purposes it's likely that GLES2 works
equally well if not better on most drivers these days, especially on
embedded devices.
Thus switch the default for EGL context creation to GLES2. This won't
affect apps that create their own context, but `gst-launch-1.0` etc.,
which are often used for testing so people don't have to pass
`GST_GL_API=gles2`.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5509>
By sealing for future writes, we broke Wayland SHM support. It seems like the
wayland library maps the SHM in read/write mode. This is visible through no
display and an error message like this:
wl_shm@7: error 2: failed mmap fd 43: Operation not permitted
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5684>
If text width ever reached 1px, for example after resizing the output window, the overlay would stop rendering
and never return again. The 1px condition itself does not seem to make much sense here anyway.
This was a chain of events: width reached 1, so the composition was set to NULL. Then, after resizing the output window,
push_frame() was called but would not attempt to renegotiate because composition is NULL. This caused the width/height
to never be updated again, as that only happens during negotiation, so the overlay was gone for good.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5614>
In rare cases - notably on macOS, because of multiple GL contexts - the lack of a sync point was causing overlays
to disappear for a frame after being redrawn, or sometimes not appear at all. This change makes sure that the display
in one GL context will be correctly synchronised with the other GL context where the overlay texture was uploaded.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5610>
There is no guarantee that g_get_user_runtime_dir() is in a tmpfs. Using
an explicit shared memory API seems safer for all POSIX platforms.
Note that Android does not have shm_open() and only added memfd_create()
since API level 30 (Android 11).
Sponsored-by: Netflix Inc.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5328>
