Re: [clutter] Lots of questions: GstVideoTexture cloning, strange rotation, offscreen rendering to onscreen displaying, more gobject signals...

Hi,

I'm also a clutter beginner, but I think I'm able to answer at least a
few questions.

On Mon, Aug 20, 2007 at 07:57:39PM +0200, Florent THIERY wrote:
> * to clone gst video textures, which i did not manage to do (based on
> regular texture cloning examples)

so, it seems you're using pyclutter. the following works fine fore me:

video_texture = cluttergst.VideoTexture()
video_sink = cluttergst.VideoSink(video_texture)
stage.add(video_texture)
video_texture.show()
video_copy = clutter.CloneTexture(video_texture)
stage.add(video_copy)
video_copy.show()

of coure you also have to set the size and position of your textures

> * to pre-render an offscreen scene, and then display it
> * to export frames from the current stage, or ultimately render to a
> file (or gst src element); i'm looking for a way to pass frames in an
> efficient way

exporting frames as a gst.Buffer would be a very cool feature, i agree.
at least you can take a pixbuf snapshot of the stage via
stage.snapshot(x, y, width, height)

> * to modify a gst pipeline without stopping/restarting it (ex: adding
> warptv effect without interruption)

you have to create a custom gstreamer pipeline to do this, I don't think
this can be done with a normal playbin. you can change/add elements via

1) blocking the src-pad of the element after which you want to insert
   the new one
2) unlink the src-pad after the block happens
3) add the new element to the pipeline
4) link the pads together again
5) unblock the src-pad

a more detailed description can be found in
http://webcvs.freedesktop.org/gstreamer/gstreamer/docs/design/part-block.txt?revision=1.6&view=markup

> * to crop video textures

I don't know if this can be done with clutter, but you can crop videos
with gstreamer. take on the videobox and videocrop elements.

> * to share gobject signals between apps ; i'm looking for a way to
> trigger actions (be it key presses emulation) in clutter from a
> separate application (clutter apps or misc ones); anybody tried the
> following approach?
> (http://www.daa.com.au/pipermail/pygtk/2006-May/012289.html)

you could take DBus for this.

so long

:wq buz

-- 
Multitasking = screwing up several things at once.
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