Getting size size with playbin2

[Sebastian Dröge]

On Di, 2013-06-11 at 10:11 +0300, Nikos Chantziaras wrote:
> There doesn't seem to be a direct way to get the video size (its 
> resolution, not byte size) in GStreamer.  I'm not sure how to do this. 
> It seems I have to watch for some signal from the pipeline (I'm using 
> playbin2) which is emitted when that information becomes available.  But 
> which signal?  And once it's emitted, how do I extract that information?
> 
> It all seems awfully round-about for such a simple operation, and it's 
> not clear at all how to proceed with this.  Any hints?
> 
> I'm on GStreamer 0.10.36.

You could connect to the "notify::caps" signal of the sinkpad of the
video sink, then get the caps (gst_pad_get_negotiated_caps()) and then
use the GstCaps and GstStructure API to extract width, height and
pixel-aspect-ratio.
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