GStreamer 1.2.1, vs2013, cinder 0.8.5 and a 'hello world'

[Sebastian Dröge]

On Mo, 2013-11-25 at 20:30 +0900, Lasse Laursen wrote:
> Hey,
> 
> I've posted a bit previously about intentions of using GStreamer for 
> streaming some video to an OpenGL texture. It resulted in a drawn out 
> period of development where I spent about 2-3 weeks scrambling trying to 
> recompile this and that and using all sorts of tools. Sufficed to say - 
> it's taking me too long to figure out how to do that, so I'm forced to 
> try a much, much simpler approach, just to get something simple working.
> 
> Essentially I'm just content with getting a set of raw frames out of a 
> video using gstreamer and putting these in memory for my own use. I know 
> that can easily ballon to several hundred megs, but I'm content with 
> restricting myself to smaller film clips.
> 
> So I grabbed the latest releases of gstreamer 1.2.1 and got to work 
> compiling the following simple 'hello world' example:
> 
> void VideoMaster::gstTesting3()
> {
> [...]
> }
> 
> So - if I run the command 'playbin 
> uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm' straight 
> from the command line gst-launch-1.0.exe, then things work out fine more 
> or less. However, in my cinder application I get a big fat nothing.
> 
> I'm assuming this may have something to do with the fact that Cinder 
> creates its own personal OpenGL rendering context and this simple 'hello 
> world' example tries to create it's own rendering window which somehow 
> creates trouble?
> 
> I am a bit puzzled though as the pipeline object itself just becomes a 
> NULL object. Perhaps that's normal behavior if something goes wrong?

What do you mean with it becomes a NULL object? Does
gst_element_factory_make() already return NULL?

> While I'm on a roll here - I was also wondering if someone could point 
> me in the direction of what I should be looking at if I'm interested in 
> letting the program open any video file gStreamer can handle, and 
> putting them into a sink that allows me to extract raw single frame data?

You probably want to use an appsink as video-sink, and from that grab
the raw video frames and convert them to an OpenGL texture. 

Alternatively take a look at gst-plugins-gl.

-- 
Sebastian Dröge <sebastian at centricular.com>
Centricular Ltd - http://www.centricular.com
Expertise, Straight from the Source
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 966 bytes
Desc: This is a digitally signed message part
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20131125/475a7bb7/attachment-0001.pgp>