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GLX context creation in qmlglsink

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Dmitry Lavnikevich
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GLX context creation in qmlglsink

Dmitry Lavnikevich
Hi, everyone!

I am currently trying to run qmlglsink on my x86 Yocto platform. I use
the simpliest qmlsink example from the the gst-plugins-bad sources. It
runs ok under X11 on my desktop machine. But on the Yocto build I see
that the GLX context cannot be wrapped because
glXGetCurrentContext()
returns NULL at every call.

Thus the question, what exactly should create this context and make it
current. What may I be missing from dependencies? I have built:
* qt 5.7 with -opengl desktop
* gst-plugins-bad with --enable-opengl --enable-glx

What am I missing? Where to look further? Any additional information I
should provide?

...
INFO               GST_EVENT
gstpad.c:5655:gst_pad_send_event_unchecked:<gluploadelement0:src>
Received event on flushing pad. Discarding
DEBUG                GST_BUS gstbus.c:317:gst_bus_post:<bus0> [msg
0x7b1c90] posting on bus structure-change message: 0x7b1c90, time
99:99:99.999999999, seq-num 5, element
'sink', GstMessageStructureChange,
type=(GstStructureChangeType)GST_STRUCTURE_CHANGE_TYPE_PAD_LINK,
owner=(GstElement)"\(GstGLUploadElement\)\ gluploadelement0",
busy=(boolean)false;
DEBUG                    bin
gstbin.c:3728:gst_bin_handle_message_func:<pipeline0> [msg 0x7b1c90]
handling child sink message of type structure-change
DEBUG                    bin
gstbin.c:988:bin_remove_messages:<qtsink0:sink> deleting message
0x7b1c10 of type structure-change (types 0x00001000)
DEBUG                GST_BUS gstbus.c:352:gst_bus_post:<bus0> [msg
0x7b1c90] dropped
DEBUG       GST_ELEMENT_PADS gstutils.c:1763:gst_element_link_pads_full:
linked pad gluploadelement0:src to pad qtsink0:sink
INFO             qtglutility gstqtglutility.cc:65:gst_qt_get_gl_display:
QGuiApplication::instance()->platformName() xcb
DEBUG             GST_MEMORY gstallocator.c:210:gst_allocator_register:
registering allocator 0xaee0d0 with name "GLBuffer"
DEBUG             GST_MEMORY gstallocator.c:210:gst_allocator_register:
registering allocator 0xaee1e0 with name "GLMemory"
DEBUG             GST_MEMORY gstallocator.c:210:gst_allocator_register:
registering allocator 0xaef020 with name "GLMemoryPBO"
DEBUG             GST_MEMORY gstallocator.c:210:gst_allocator_register:
registering allocator 0xaee2f0 with name "GLRenderbuffer"
DEBUG             qtglwidget qtitem.cc:132:QtGLVideoItem: 0x9d4770 init
Qt Video Item
DEBUG             qtglwidget qtitem.cc:263:onSceneGraphInitialized:
scene graph initialization with Qt GL context 0x992f80
** (my-qt-test:715): CRITICAL **: gst_gl_context_get_gl_api: assertion
'GST_IS_GL_CONTEXT (context)' failed
WARN               glcontext
gstglcontext.c:506:gst_gl_context_get_current_gl_context: Could not
retrieve current context
WARN             qtglutility
gstqtglutility.cc:158:gst_qt_get_gl_wrapcontext: About to check
HANDLE=0x00000000
ERROR            qtglutility
gstqtglutility.cc:173:gst_qt_get_gl_wrapcontext: cannot wrap qt OpenGL
context
** (my-qt-test:715): CRITICAL **: gst_gl_context_get_gl_api: assertion
'GST_IS_GL_CONTEXT (context)' failed
DEBUG             qtglwidget qtitem.cc:284:onSceneGraphInitialized:
0x9d4770 created wrapped GL context (NULL)
DEBUG             GST_STATES
gstelement.c:2570:gst_element_set_state_func:<pipeline0> set_state to
PLAYING
DEBUG             GST_STATES
gstelement.c:2595:gst_element_set_state_func:<pipeline0> setting target
state to PLAYING
DEBUG             GST_STATES
gstelement.c:2608:gst_element_set_state_func:<pipeline0> current NULL,
old_pending VOID_PENDING, next VOID_PENDING, old return SUCCESS
DEBUG             GST_STATES
gstelement.c:2642:gst_element_set_state_func:<pipeline0> intermediate:
setting state from NULL to READY
DEBUG                GST_BUS gstbus.c:471:gst_bus_set_flushing:<bus1>
unset bus flushing
DEBUG             GST_STATES
gstbin.c:2863:gst_bin_change_state_func:<pipeline0> changing state of
children from NULL to READY
DEBUG                    bin
gstbin.c:2900:gst_bin_change_state_func:<pipeline0> clearing all cached
messages
DEBUG                    bin
gstbin.c:2708:gst_bin_src_pads_activate:<pipeline0> deactivate pads
DEBUG                    bin
gstbin.c:2716:gst_bin_src_pads_activate:<pipeline0> pad deactivation
successful
DEBUG                    bin
gstbin.c:2394:gst_bin_sort_iterator_resync:<pipeline0> resync
DEBUG                    bin gstbin.c:2180:add_to_queue:<pipeline0>
adding 'qtsink0' to queue
DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
message found matching types 00001000
DEBUG                    bin gstbin.c:919:find_message:<pipeline0>  
structure-change
DEBUG                    bin gstbin.c:2297:update_degree:<pipeline0>
change element gluploadelement0, degree 0->1, linked to qtsink0
DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
message found matching types 00001000
DEBUG                    bin gstbin.c:919:find_message:<pipeline0>  
structure-change
DEBUG                    bin gstbin.c:2297:update_degree:<pipeline0>
change element videotestsrc0, degree 0->1, linked to gluploadelement0
DEBUG                    bin gstbin.c:2320:update_degree:<pipeline0>
element videotestsrc0 not linked on any sinkpads
DEBUG                    bin
gstbin.c:2381:gst_bin_sort_iterator_next:<pipeline0> queue head gives
qtsink0
DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
message found matching types 00001000
DEBUG                    bin gstbin.c:919:find_message:<pipeline0>  
structure-change
DEBUG                    bin gstbin.c:2297:update_degree:<pipeline0>
change element gluploadelement0, degree 1->0, linked to qtsink0
DEBUG                    bin gstbin.c:2180:add_to_queue:<pipeline0>
adding 'gluploadelement0' to queue
INFO              GST_STATES
gstbin.c:2515:gst_bin_element_set_state:<qtsink0> current NULL pending
VOID_PENDING, desired next READY
DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
message found matching types 00100000
DEBUG                    bin gstbin.c:919:find_message:<pipeline0>  
async-start
DEBUG                    bin
gstbin.c:2610:gst_bin_element_set_state:<pipeline0> setting element
qtsink0 to READY, base_time 0:00:00.000000000
DEBUG             GST_STATES
gstelement.c:2570:gst_element_set_state_func:<qtsink0> set_state to READY
DEBUG             GST_STATES
gstelement.c:2595:gst_element_set_state_func:<qtsink0> setting target
state to READY
DEBUG             GST_STATES
gstelement.c:2608:gst_element_set_state_func:<qtsink0> current NULL,
old_pending VOID_PENDING, next VOID_PENDING, old return SUCCESS
DEBUG             GST_STATES
gstelement.c:2642:gst_element_set_state_func:<qtsink0> final: setting
state from NULL to READY
DEBUG                 qtsink gstqtsink.cc:303:gst_qt_sink_change_state:
changing state: NULL => READY
ERROR             qtglwidget qtitem.cc:340:qt_item_init_winsys: 0x9d4770
failed to retrieve wrapped context (NULL)
WARN                  qtsink
gstqtsink.cc:325:gst_qt_sink_change_state:<qtsink0> error: Could not
initialize window system

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Matthew Waters
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Re: GLX context creation in qmlglsink

Matthew Waters
On 22/03/17 17:09, Dmitry Lavnikevich wrote:

> Hi, everyone!
>
> I am currently trying to run qmlglsink on my x86 Yocto platform. I use
> the simpliest qmlsink example from the the gst-plugins-bad sources. It
> runs ok under X11 on my desktop machine. But on the Yocto build I see
> that the GLX context cannot be wrapped because
> glXGetCurrentContext()
> returns NULL at every call.
>
> Thus the question, what exactly should create this context and make it
> current. What may I be missing from dependencies? I have built:
> * qt 5.7 with -opengl desktop
> * gst-plugins-bad with --enable-opengl --enable-glx
Chances are that Qt isn't using GLX if glxGetCurrentContext() is
returning NULL.  Is it using EGL instead here?

Cheers
-Matt

> What am I missing? Where to look further? Any additional information I
> should provide?
>
> ...
> INFO               GST_EVENT
> gstpad.c:5655:gst_pad_send_event_unchecked:<gluploadelement0:src>
> Received event on flushing pad. Discarding
> DEBUG                GST_BUS gstbus.c:317:gst_bus_post:<bus0> [msg
> 0x7b1c90] posting on bus structure-change message: 0x7b1c90, time
> 99:99:99.999999999, seq-num 5, element
> 'sink', GstMessageStructureChange,
> type=(GstStructureChangeType)GST_STRUCTURE_CHANGE_TYPE_PAD_LINK,
> owner=(GstElement)"\(GstGLUploadElement\)\ gluploadelement0",
> busy=(boolean)false;
> DEBUG                    bin
> gstbin.c:3728:gst_bin_handle_message_func:<pipeline0> [msg 0x7b1c90]
> handling child sink message of type structure-change
> DEBUG                    bin
> gstbin.c:988:bin_remove_messages:<qtsink0:sink> deleting message
> 0x7b1c10 of type structure-change (types 0x00001000)
> DEBUG                GST_BUS gstbus.c:352:gst_bus_post:<bus0> [msg
> 0x7b1c90] dropped
> DEBUG       GST_ELEMENT_PADS
> gstutils.c:1763:gst_element_link_pads_full: linked pad
> gluploadelement0:src to pad qtsink0:sink
> INFO             qtglutility
> gstqtglutility.cc:65:gst_qt_get_gl_display:
> QGuiApplication::instance()->platformName() xcb
> DEBUG             GST_MEMORY
> gstallocator.c:210:gst_allocator_register: registering allocator
> 0xaee0d0 with name "GLBuffer"
> DEBUG             GST_MEMORY
> gstallocator.c:210:gst_allocator_register: registering allocator
> 0xaee1e0 with name "GLMemory"
> DEBUG             GST_MEMORY
> gstallocator.c:210:gst_allocator_register: registering allocator
> 0xaef020 with name "GLMemoryPBO"
> DEBUG             GST_MEMORY
> gstallocator.c:210:gst_allocator_register: registering allocator
> 0xaee2f0 with name "GLRenderbuffer"
> DEBUG             qtglwidget qtitem.cc:132:QtGLVideoItem: 0x9d4770
> init Qt Video Item
> DEBUG             qtglwidget qtitem.cc:263:onSceneGraphInitialized:
> scene graph initialization with Qt GL context 0x992f80
> ** (my-qt-test:715): CRITICAL **: gst_gl_context_get_gl_api: assertion
> 'GST_IS_GL_CONTEXT (context)' failed
> WARN               glcontext
> gstglcontext.c:506:gst_gl_context_get_current_gl_context: Could not
> retrieve current context
> WARN             qtglutility
> gstqtglutility.cc:158:gst_qt_get_gl_wrapcontext: About to check
> HANDLE=0x00000000
> ERROR            qtglutility
> gstqtglutility.cc:173:gst_qt_get_gl_wrapcontext: cannot wrap qt OpenGL
> context
> ** (my-qt-test:715): CRITICAL **: gst_gl_context_get_gl_api: assertion
> 'GST_IS_GL_CONTEXT (context)' failed
> DEBUG             qtglwidget qtitem.cc:284:onSceneGraphInitialized:
> 0x9d4770 created wrapped GL context (NULL)
> DEBUG             GST_STATES
> gstelement.c:2570:gst_element_set_state_func:<pipeline0> set_state to
> PLAYING
> DEBUG             GST_STATES
> gstelement.c:2595:gst_element_set_state_func:<pipeline0> setting
> target state to PLAYING
> DEBUG             GST_STATES
> gstelement.c:2608:gst_element_set_state_func:<pipeline0> current NULL,
> old_pending VOID_PENDING, next VOID_PENDING, old return SUCCESS
> DEBUG             GST_STATES
> gstelement.c:2642:gst_element_set_state_func:<pipeline0> intermediate:
> setting state from NULL to READY
> DEBUG                GST_BUS gstbus.c:471:gst_bus_set_flushing:<bus1>
> unset bus flushing
> DEBUG             GST_STATES
> gstbin.c:2863:gst_bin_change_state_func:<pipeline0> changing state of
> children from NULL to READY
> DEBUG                    bin
> gstbin.c:2900:gst_bin_change_state_func:<pipeline0> clearing all
> cached messages
> DEBUG                    bin
> gstbin.c:2708:gst_bin_src_pads_activate:<pipeline0> deactivate pads
> DEBUG                    bin
> gstbin.c:2716:gst_bin_src_pads_activate:<pipeline0> pad deactivation
> successful
> DEBUG                    bin
> gstbin.c:2394:gst_bin_sort_iterator_resync:<pipeline0> resync
> DEBUG                    bin gstbin.c:2180:add_to_queue:<pipeline0>
> adding 'qtsink0' to queue
> DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
> message found matching types 00001000
> DEBUG                    bin gstbin.c:919:find_message:<pipeline0>  
> structure-change
> DEBUG                    bin gstbin.c:2297:update_degree:<pipeline0>
> change element gluploadelement0, degree 0->1, linked to qtsink0
> DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
> message found matching types 00001000
> DEBUG                    bin gstbin.c:919:find_message:<pipeline0>  
> structure-change
> DEBUG                    bin gstbin.c:2297:update_degree:<pipeline0>
> change element videotestsrc0, degree 0->1, linked to gluploadelement0
> DEBUG                    bin gstbin.c:2320:update_degree:<pipeline0>
> element videotestsrc0 not linked on any sinkpads
> DEBUG                    bin
> gstbin.c:2381:gst_bin_sort_iterator_next:<pipeline0> queue head gives
> qtsink0
> DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
> message found matching types 00001000
> DEBUG                    bin gstbin.c:919:find_message:<pipeline0>  
> structure-change
> DEBUG                    bin gstbin.c:2297:update_degree:<pipeline0>
> change element gluploadelement0, degree 1->0, linked to qtsink0
> DEBUG                    bin gstbin.c:2180:add_to_queue:<pipeline0>
> adding 'gluploadelement0' to queue
> INFO              GST_STATES
> gstbin.c:2515:gst_bin_element_set_state:<qtsink0> current NULL pending
> VOID_PENDING, desired next READY
> DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
> message found matching types 00100000
> DEBUG                    bin gstbin.c:919:find_message:<pipeline0>  
> async-start
> DEBUG                    bin
> gstbin.c:2610:gst_bin_element_set_state:<pipeline0> setting element
> qtsink0 to READY, base_time 0:00:00.000000000
> DEBUG             GST_STATES
> gstelement.c:2570:gst_element_set_state_func:<qtsink0> set_state to READY
> DEBUG             GST_STATES
> gstelement.c:2595:gst_element_set_state_func:<qtsink0> setting target
> state to READY
> DEBUG             GST_STATES
> gstelement.c:2608:gst_element_set_state_func:<qtsink0> current NULL,
> old_pending VOID_PENDING, next VOID_PENDING, old return SUCCESS
> DEBUG             GST_STATES
> gstelement.c:2642:gst_element_set_state_func:<qtsink0> final: setting
> state from NULL to READY
> DEBUG                 qtsink
> gstqtsink.cc:303:gst_qt_sink_change_state: changing state: NULL => READY
> ERROR             qtglwidget qtitem.cc:340:qt_item_init_winsys:
> 0x9d4770 failed to retrieve wrapped context (NULL)
> WARN                  qtsink
> gstqtsink.cc:325:gst_qt_sink_change_state:<qtsink0> error: Could not
> initialize window system
>
>


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Dmitry Lavnikevich
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Re: GLX context creation in qmlglsink

Dmitry Lavnikevich
On 22/03/17 14:01, Matthew Waters wrote:

> On 22/03/17 17:09, Dmitry Lavnikevich wrote:
>> Hi, everyone!
>>
>> I am currently trying to run qmlglsink on my x86 Yocto platform. I use
>> the simpliest qmlsink example from the the gst-plugins-bad sources. It
>> runs ok under X11 on my desktop machine. But on the Yocto build I see
>> that the GLX context cannot be wrapped because
>> glXGetCurrentContext()
>> returns NULL at every call.
>>
>> Thus the question, what exactly should create this context and make it
>> current. What may I be missing from dependencies? I have built:
>> * qt 5.7 with -opengl desktop
>> * gst-plugins-bad with --enable-opengl --enable-glx
>
> Chances are that Qt isn't using GLX if glxGetCurrentContext() is
> returning NULL.  Is it using EGL instead here?

Thanks! I have found out that indeed glx gl integration has somewhy
failed. And so egl is used instead.

Best regards,
Dmitry

> Cheers
> -Matt
>
>> What am I missing? Where to look further? Any additional information I
>> should provide?
>>
>> ...
>> INFO               GST_EVENT
>> gstpad.c:5655:gst_pad_send_event_unchecked:<gluploadelement0:src>
>> Received event on flushing pad. Discarding
>> DEBUG                GST_BUS gstbus.c:317:gst_bus_post:<bus0> [msg
>> 0x7b1c90] posting on bus structure-change message: 0x7b1c90, time
>> 99:99:99.999999999, seq-num 5, element
>> 'sink', GstMessageStructureChange,
>> type=(GstStructureChangeType)GST_STRUCTURE_CHANGE_TYPE_PAD_LINK,
>> owner=(GstElement)"\(GstGLUploadElement\)\ gluploadelement0",
>> busy=(boolean)false;
>> DEBUG                    bin
>> gstbin.c:3728:gst_bin_handle_message_func:<pipeline0> [msg 0x7b1c90]
>> handling child sink message of type structure-change
>> DEBUG                    bin
>> gstbin.c:988:bin_remove_messages:<qtsink0:sink> deleting message
>> 0x7b1c10 of type structure-change (types 0x00001000)
>> DEBUG                GST_BUS gstbus.c:352:gst_bus_post:<bus0> [msg
>> 0x7b1c90] dropped
>> DEBUG       GST_ELEMENT_PADS
>> gstutils.c:1763:gst_element_link_pads_full: linked pad
>> gluploadelement0:src to pad qtsink0:sink
>> INFO             qtglutility
>> gstqtglutility.cc:65:gst_qt_get_gl_display:
>> QGuiApplication::instance()->platformName() xcb
>> DEBUG             GST_MEMORY
>> gstallocator.c:210:gst_allocator_register: registering allocator
>> 0xaee0d0 with name "GLBuffer"
>> DEBUG             GST_MEMORY
>> gstallocator.c:210:gst_allocator_register: registering allocator
>> 0xaee1e0 with name "GLMemory"
>> DEBUG             GST_MEMORY
>> gstallocator.c:210:gst_allocator_register: registering allocator
>> 0xaef020 with name "GLMemoryPBO"
>> DEBUG             GST_MEMORY
>> gstallocator.c:210:gst_allocator_register: registering allocator
>> 0xaee2f0 with name "GLRenderbuffer"
>> DEBUG             qtglwidget qtitem.cc:132:QtGLVideoItem: 0x9d4770
>> init Qt Video Item
>> DEBUG             qtglwidget qtitem.cc:263:onSceneGraphInitialized:
>> scene graph initialization with Qt GL context 0x992f80
>> ** (my-qt-test:715): CRITICAL **: gst_gl_context_get_gl_api: assertion
>> 'GST_IS_GL_CONTEXT (context)' failed
>> WARN               glcontext
>> gstglcontext.c:506:gst_gl_context_get_current_gl_context: Could not
>> retrieve current context
>> WARN             qtglutility
>> gstqtglutility.cc:158:gst_qt_get_gl_wrapcontext: About to check
>> HANDLE=0x00000000
>> ERROR            qtglutility
>> gstqtglutility.cc:173:gst_qt_get_gl_wrapcontext: cannot wrap qt OpenGL
>> context
>> ** (my-qt-test:715): CRITICAL **: gst_gl_context_get_gl_api: assertion
>> 'GST_IS_GL_CONTEXT (context)' failed
>> DEBUG             qtglwidget qtitem.cc:284:onSceneGraphInitialized:
>> 0x9d4770 created wrapped GL context (NULL)
>> DEBUG             GST_STATES
>> gstelement.c:2570:gst_element_set_state_func:<pipeline0> set_state to
>> PLAYING
>> DEBUG             GST_STATES
>> gstelement.c:2595:gst_element_set_state_func:<pipeline0> setting
>> target state to PLAYING
>> DEBUG             GST_STATES
>> gstelement.c:2608:gst_element_set_state_func:<pipeline0> current NULL,
>> old_pending VOID_PENDING, next VOID_PENDING, old return SUCCESS
>> DEBUG             GST_STATES
>> gstelement.c:2642:gst_element_set_state_func:<pipeline0> intermediate:
>> setting state from NULL to READY
>> DEBUG                GST_BUS gstbus.c:471:gst_bus_set_flushing:<bus1>
>> unset bus flushing
>> DEBUG             GST_STATES
>> gstbin.c:2863:gst_bin_change_state_func:<pipeline0> changing state of
>> children from NULL to READY
>> DEBUG                    bin
>> gstbin.c:2900:gst_bin_change_state_func:<pipeline0> clearing all
>> cached messages
>> DEBUG                    bin
>> gstbin.c:2708:gst_bin_src_pads_activate:<pipeline0> deactivate pads
>> DEBUG                    bin
>> gstbin.c:2716:gst_bin_src_pads_activate:<pipeline0> pad deactivation
>> successful
>> DEBUG                    bin
>> gstbin.c:2394:gst_bin_sort_iterator_resync:<pipeline0> resync
>> DEBUG                    bin gstbin.c:2180:add_to_queue:<pipeline0>
>> adding 'qtsink0' to queue
>> DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
>> message found matching types 00001000
>> DEBUG                    bin gstbin.c:919:find_message:<pipeline0>
>> structure-change
>> DEBUG                    bin gstbin.c:2297:update_degree:<pipeline0>
>> change element gluploadelement0, degree 0->1, linked to qtsink0
>> DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
>> message found matching types 00001000
>> DEBUG                    bin gstbin.c:919:find_message:<pipeline0>
>> structure-change
>> DEBUG                    bin gstbin.c:2297:update_degree:<pipeline0>
>> change element videotestsrc0, degree 0->1, linked to gluploadelement0
>> DEBUG                    bin gstbin.c:2320:update_degree:<pipeline0>
>> element videotestsrc0 not linked on any sinkpads
>> DEBUG                    bin
>> gstbin.c:2381:gst_bin_sort_iterator_next:<pipeline0> queue head gives
>> qtsink0
>> DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
>> message found matching types 00001000
>> DEBUG                    bin gstbin.c:919:find_message:<pipeline0>
>> structure-change
>> DEBUG                    bin gstbin.c:2297:update_degree:<pipeline0>
>> change element gluploadelement0, degree 1->0, linked to qtsink0
>> DEBUG                    bin gstbin.c:2180:add_to_queue:<pipeline0>
>> adding 'gluploadelement0' to queue
>> INFO              GST_STATES
>> gstbin.c:2515:gst_bin_element_set_state:<qtsink0> current NULL pending
>> VOID_PENDING, desired next READY
>> DEBUG                    bin gstbin.c:912:find_message:<pipeline0> no
>> message found matching types 00100000
>> DEBUG                    bin gstbin.c:919:find_message:<pipeline0>
>> async-start
>> DEBUG                    bin
>> gstbin.c:2610:gst_bin_element_set_state:<pipeline0> setting element
>> qtsink0 to READY, base_time 0:00:00.000000000
>> DEBUG             GST_STATES
>> gstelement.c:2570:gst_element_set_state_func:<qtsink0> set_state to READY
>> DEBUG             GST_STATES
>> gstelement.c:2595:gst_element_set_state_func:<qtsink0> setting target
>> state to READY
>> DEBUG             GST_STATES
>> gstelement.c:2608:gst_element_set_state_func:<qtsink0> current NULL,
>> old_pending VOID_PENDING, next VOID_PENDING, old return SUCCESS
>> DEBUG             GST_STATES
>> gstelement.c:2642:gst_element_set_state_func:<qtsink0> final: setting
>> state from NULL to READY
>> DEBUG                 qtsink
>> gstqtsink.cc:303:gst_qt_sink_change_state: changing state: NULL => READY
>> ERROR             qtglwidget qtitem.cc:340:qt_item_init_winsys:
>> 0x9d4770 failed to retrieve wrapped context (NULL)
>> WARN                  qtsink
>> gstqtsink.cc:325:gst_qt_sink_change_state:<qtsink0> error: Could not
>> initialize window system
>>
>>
>
>
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