[gst-devel] What happens after XvShmPutImage in xvimagesink? ==> GStreamer xvimagesink with QGraphicsWidget

[Zhao, Halley]

I often heard X overlay, and regard that xvimagesink goes through X overlay to be accelerated. 
But now, I get confused when XvShmPutImage will show nothing in QGraphicsView.
If it goes through overlay, then what else could prevent the video showing on screen?
And what details happen after XvShmPutImage in xvimagesink?

Stefan and Kiagiadakis had told me something about it before, and I had turn to use shader for video rendering in QGraphicsView, 
However I'm still curious about the above question. Maybe Qt has done something magic to ignore the XvShmPutImage?

BR


-----Original Message-----
From: Stefan Kost [mailto:ensonic at hora-obscura.de] 
Sent: 2010年4月2日 17:53
To: Discussion of the development of GStreamer
Cc: Zhao, Halley
Subject: Re: [gst-devel] GStreamer xvimagesink with QGraphicsWidget

Am 02.04.2010 11:31, schrieb Zhao, Halley:
>  
> 
> On Linux/X based platform, GStreamer xvimagesink works well with QWidget
> since QWidget’s winId() could connect to xvimagesink
> 
>  
> 
> In order to get rich user experience, I try to use QGraphics*.
> 
> QGraphicsWidget doesn’t associate with xid, I tried to add QWidget to
> QGraphicsProxyWidget. Then it could be used in QGraphicsScene.
> 
> There is no video at all, though audio playback well at the same time,
> and log from xvimagesink also looks well since _/put/_frame() is called
> timely.

At first there are two basic qt example now in
gst-plugins-base/tests/examples/overlay. QGraphicsView did indeed not cooperate
well with overlays. To remedy currect gst-plugins-base git version extended the
xoverlay interface to allow specifying a render_rectangle. There is also an
example for that gst-plugins-base/tests/icles/test-xoverlay.c

> 
> Is there anyone else try it before?
> 
> *ZHAO, Halley (Aihua)*

I recommend you to subscribe to gstreamer-cvs mailing list too:
gstreamer-cvs at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/gstreamer-cvs

Despite the name, it shows all commits. Quite useful to stay up to date.

Greetings,
Stefan

> 
> Email: halley.zhao at intel.com <blocked::mailto:aihua.zhao at intel.com>
> 
> Tel: +86(21)61166476   iNet: 8821-6476
> 
> SSG/OTC/Moblin 3W038 Pole: F4
> 
>  
> 
> 
> 
> ------------------------------------------------------------------------------
> Download Intel&#174; Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
> 
> 
> 
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel