Capturing an OpenGL window and re displaying it using GStreamer Appsrc

[Dušan Poizl]

1. add videoflip method=vertical-flip element. in OpenGL the origin is 
in bottom left corner of screen. not in top left like usual.

2. something must introduce latency in your application. because I also 
capture OpenGL with glReadPixels() feeding it to appsrc and can display 
it with xvimagesink. the latency is like 0.1-0.2 second. but I don't 
think you can expect go any lower. especially as encoding introduce more 
latency.

Dňa 26.03.2014 03:36, fahad wrote / napísal(a):
> AppSrcTest.cpp
> <http://gstreamer-devel.966125.n4.nabble.com/file/n4666109/AppSrcTest.cpp>
>
> I started by using the appsrc example and extended it to feed raw pixel
> data. I am attempting to see what kind of delay I will come across during
> this process. i am having two issues at this point.
>
> 1-Capturing the window using glReadPixels() kind of works but end result in
> gstreamer output windows is not the same, its upside down and all over the
> place. I think i need to come up with a better caps filter or further modify
> the captured pixel before feeding it to appsrc, but at this point I cannot
> figure out what to do
>
> 2-There is a significant delay between the OGL and Gstreamer window, is
> there a possibility to improve this delay some how. My end goal would be to
> try and transport the captured window by encoding it to mpeg2 and broadcast
> over UDP. Just from this simple result it would seem that the delay is way
> too much to even attempt that.
>
> any pointers/suggestions are appreciated.
>
> Running on Windows with FreeGlut and GStreamer 1.0 (1.2.1)
>
>
>
> --
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