Caps to set for streaming openGL framebuffer from appsrc

[Arvin6]

$ 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 at .freedesktop

> > on behalf of Arvin6 <

> arvindn995@

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

> gstreamer-devel at .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.
> 
> 
> 
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