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Caps to set for streaming openGL framebuffer from appsrc

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Arvin6

Caps to set for streaming openGL framebuffer from appsrc

What caps are to be set for streaming openGL framebuffer? I used
"video/x-raw","width", G_TYPE_INT, 640, "height", G_TYPE_INT, 480 but I get
a negotiation error. Please help.

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Martin Vachovski

Re: Caps to set for streaming openGL framebuffer from appsrc

Try

video/x-raw(memory:GLMemory)

On the console, the brackets need to be escaped:

gst-launch-1.0.exe videotestsrc ! glupload ! video/x-raw$memory:GLMemory$ ! gldownload ! videoconvert ! autovideosink

Cheers
Martin

________________________________________
From: gstreamer-devel <[hidden email]> on behalf of Arvin6 <[hidden email]>
Sent: Tuesday, October 3, 2017 9:58 AM
To: [hidden email]
Subject: Caps to set for streaming openGL framebuffer from appsrc

What caps are to be set for streaming openGL framebuffer? I used
"video/x-raw","width", G_TYPE_INT, 640, "height", G_TYPE_INT, 480 but I get
a negotiation error. Please help.

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Arvin6

Re: Caps to set for streaming openGL framebuffer from appsrc

$ gst-launch-1.0 videotestsrc ! glupload ! video/x-raw$memory:GLMemory$ !
gldownload ! videoconvert ! autovideosink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...

** (gst-launch-1.0:4745): CRITICAL **: gst_gl_window_get_context: assertion
'GST_IS_GL_WINDOW (window)' failed
Caught SIGSEGV
exec gdb failed: No such file or directory
Spinning. Please run 'gdb gst-launch-1.0 4745' to continue debugging,
Ctrl-C to quit, or Ctrl-\ to dump core.

I get this error. Also, my real problem is streaming openGL framebuffer on
tcp. I get a number of issues like,

ERROR from element Our-Source: Internal data stream error.
Debugging info: gstbasesrc.c(2939): void gst_base_src_loop(GstPad *) ():
/GstPipeline:ppipe/GstAppSrc:Our-Source:
streaming stopped, reason not-linked (-1)

do you have any idea on that part?
Martin Vachovski wrote

> Try
>
> video/x-raw(memory:GLMemory)
>
> On the console, the brackets need to be escaped:
>
> gst-launch-1.0.exe videotestsrc ! glupload !
> video/x-raw$memory:GLMemory$ ! gldownload ! videoconvert ! autovideosink
>
> Cheers
> Martin
>
> ________________________________________
> From: gstreamer-devel <

> gstreamer-devel-bounces@.freedesktop

> > on behalf of Arvin6 <

> arvindn995@

> >
> Sent: Tuesday, October 3, 2017 9:58 AM
> To:

> gstreamer-devel@.freedesktop

> Subject: Caps to set for streaming openGL framebuffer from appsrc
>
> What caps are to be set for streaming openGL framebuffer? I used
> "video/x-raw","width", G_TYPE_INT, 640, "height", G_TYPE_INT, 480 but I
> get
> a negotiation error. Please help.
>
>
>
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
> _______________________________________________
> gstreamer-devel mailing list

> gstreamer-devel@.freedesktop

> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> _______________________________________________
> gstreamer-devel mailing list

> gstreamer-devel@.freedesktop

> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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Martin Vachovski

Re: Caps to set for streaming openGL framebuffer from appsrc

Hi Arvin,

As per the first problem:
>>> ** (gst-launch-1.0:4745): CRITICAL **: gst_gl_window_get_context: assertion
>>> 'GST_IS_GL_WINDOW (window)' failed
>>> Caught SIGSEGV
>>> exec gdb failed: No such file or directory

I think that you might have problems with your gstreamer installation, opengl drivers, or the x-server.
The pipeline I suggested before works for me both under
Windows 10, gst 12.2
Ubuntu 16.04, gst 1.8.2

Try replacing the
autovideosink
with fakesink, or with ximagesink (Linux)
and see if the pipeline plays.

>>>> I get this error. Also, my real problem is streaming openGL framebuffer on
>>>> tcp. I get a number of issues like,
>>>> ERROR from element Our-Source: Internal data stream error.

I might be wrong, but as far as I understand, the
video/x-raw(memory:GLMemory)
really represents memory which is placed on your video card's memory,
so just sending it over tcp won't be easy.

You should try to download these buffers with the gldownload element first.

Hope that helps
Martin

________________________________________
From: gstreamer-devel <[hidden email]> on behalf of Arvin6 <[hidden email]>
Sent: Tuesday, October 3, 2017 11:12 AM
To: [hidden email]
Subject: Re: Caps to set for streaming openGL framebuffer from appsrc

$ gst-launch-1.0 videotestsrc ! glupload ! video/x-raw$memory:GLMemory$ !
gldownload ! videoconvert ! autovideosink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...

** (gst-launch-1.0:4745): CRITICAL **: gst_gl_window_get_context: assertion
'GST_IS_GL_WINDOW (window)' failed
Caught SIGSEGV
exec gdb failed: No such file or directory
Spinning. Please run 'gdb gst-launch-1.0 4745' to continue debugging,
Ctrl-C to quit, or Ctrl-\ to dump core.

I get this error. Also, my real problem is streaming openGL framebuffer on
tcp. I get a number of issues like,

ERROR from element Our-Source: Internal data stream error.
Debugging info: gstbasesrc.c(2939): void gst_base_src_loop(GstPad *) ():
/GstPipeline:ppipe/GstAppSrc:Our-Source:
streaming stopped, reason not-linked (-1)

do you have any idea on that part?
Martin Vachovski wrote

> gstreamer-devel-bounces@.freedesktop

> > on behalf of Arvin6 <

> arvindn995@

> >
> Sent: Tuesday, October 3, 2017 9:58 AM
> To:

> gstreamer-devel@.freedesktop

Arvin6

Re: Caps to set for streaming openGL framebuffer from appsrc

gst-launch-1.0 videotestsrc ! glupload ! video/x-raw$memory:GLMemory$ !
gldownload ! videoconvert ! osxvideosink
Setting pipeline to PAUSED ...
2017-10-03 17:02:27.904 gst-launch-1.0[5433:232813] !!! BUG: The current
event queue and the main event queue are not the same. Events will not be
handled correctly. This is probably because _TSGetMainThread was called for
the first time off the main thread.
Pipeline is PREROLLING ...
Got context from element 'gldownloadelement0': gst.gl.GLDisplay=context,
gst.gl.GLDisplay=(GstGLDisplay)"$GstGLDisplayCocoa$\ gldisplaycocoa0";

This displays a window with green screen instead of video test source. I'm
on OSX and I have been facing a lot of problems with GStreamer installation.

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Martin Vachovski

Re: Caps to set for streaming openGL framebuffer from appsrc

Hi Arvin,

Sorry, I can't be of much help with OSX

Martin
________________________________________
From: gstreamer-devel <[hidden email]> on behalf of Arvin6 <[hidden email]>
Sent: Tuesday, October 3, 2017 12:36 PM
To: [hidden email]
Subject: Re: Caps to set for streaming openGL framebuffer from appsrc

gst-launch-1.0 videotestsrc ! glupload ! video/x-raw$memory:GLMemory$ !
gldownload ! videoconvert ! osxvideosink
Setting pipeline to PAUSED ...
2017-10-03 17:02:27.904 gst-launch-1.0[5433:232813] !!! BUG: The current
event queue and the main event queue are not the same. Events will not be
handled correctly. This is probably because _TSGetMainThread was called for
the first time off the main thread.
Pipeline is PREROLLING ...
Got context from element 'gldownloadelement0': gst.gl.GLDisplay=context,
gst.gl.GLDisplay=(GstGLDisplay)"$GstGLDisplayCocoa$\ gldisplaycocoa0";

This displays a window with green screen instead of video test source. I'm
on OSX and I have been facing a lot of problems with GStreamer installation.

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