Vaapidecode Format and OpenGL

[Zelnes]

Victor Jaquez wrote
> On 06/12/17 at 04:32am, Zelnes wrote:
>> Arjen Veenhuizen wrote
>> > Your code was probably scrubbed from the mailinglist. 
>> 
>> Yes, it's also what I think. Could I post it here ?
>> 
>> 
>> Arjen Veenhuizen wrote
>> > You can run 
>> 
>> > to get an idea of the caps in use. In code, you could use the
>> notify::caps
>> > signal on a GstPad to figure out which caps are in use.
>> 
>> Thanks, I now have an idea about the format used whith autovideosink. Do
>> you
>> know how I can set the caps ? Whenever I try to create a caps :
>> GstCaps * caps = gst_caps_new_simple("video/x-raw", "format,
>> G_TYPE_STRING,
>> "RGBA", "width", G_TYPE_INT, 1920, "height", G_TYPE_INT, 1080, NULL);
>> I get a Segfault. I wanted to set this either by linking vaapidecode to
>> appsink using this filter, or by setting the caps on the vaapidecode src
>> pad.
> 
> If you are getting a segmentation fault when creating a GstCaps instances,
> that means that you have severe problems in you development
> environment. Probably you're mixing libraries in run time.

Now I am able to create GstCaps, it's okay, but I can't set it between
vaapidecodebin and appsink, or I could not link them.

Do you have a piece of code showing how to draw a frame on GPU with OpenGL,
with a frame coming directly from GPU (with vaapidecodebin) and which did
not go to the CPU ? 
I have found so many different ways, none of them worked, may be because
they are out of date. I just want an access to the GPU data, in order to
process it with OpenGL and the draw it on screen with SDL and OpenGL
(textures).

I know it is possible, but I can't figure out why my attempts all fails.


Victor Jaquez wrote
>> Arjen Veenhuizen wrote
>> > W.r.t. 
>> > GstSample
>> >
>> <https://developer.gnome.org/gstreamer/stable/gstreamer-GstSample.html>  
>> >  vs 
>> > GstBuffer
>> >
>> <https://developer.gnome.org/gstreamer/stable/gstreamer-GstBuffer.html>  
>> > , you should find everything you need in the linked docs.
>> 
>> I'm still confused. Let me explain.
>> I understand that when appsink has a new frame, it sends "new-sample"
>> signal. In the callback used for this signal, I'm able to retrieve this
>> sample, but then I don't know what to do with it. As i said, some uses
>> the
>> sample as the data to paint, but I'm not sure this is the right to do. I
>> know that I can get the buffer from this sample, but I can't find where I
>> can then get the pointer to the data, as GstBuffer is a container for
>> GStreamer.
>> 
>> 
>> 
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