[gst-devel] Pipeline state and negotiated caps.

[Stefan Kost]

Axel Philipsenburg schrieb:
> Hi everyone!
> 
> Since a few days I'm toying around with gstreamer. Got to say,
> I'm in love with the concept and the amount of language bindings.
> Good job!
> 
> And of course I ran into my first dead end while trying to do
> a simple transcoding application.
> 
> The problem is, that I can't reliably retrieve negotiated
> capabilities from pads.
> 
> Here's what I do, using the Java bindings:
> 
> I link a filesource and a decodebin element and connect
> a class to its PAD_ADDED event (signal?).
> 
> When this event fires, I link a fakesink element to each
> created pad and store the pads in a list.
> 
> Then I set the pipeline to PAUSE, try to wait for it to reach that
> state and then use the list of pads to retrieve their negotiated
> caps.

You can get the caps when the signal fires. No need to wait. Have a look at what
transmageddon does in python.

STefan

> 
> This works sometimes, especially if I delay the retrieval
> some seconds after setting the pipeline to PAUSE.
> 
> My question is, is this the right way at all to retrieve
> informations such as video resolution? I suppose the
> reason that I sometimes don't get the negotiated caps
> properly  is the fact that they are still not set then.
> The video might be still prerolling, as I understand
> that setting the state is a non-blocking function.
> 
> Thanks a lot in advance!
> 
> See ya,
> 
> Axel
> 
> 
> 
> 
> 
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