[gst-devel] demux with spider?

[Mathew Spencer]

Thanks for the pointers.

The problem I was having seemed to be that the templates for the pads 
were being attached in plugin_init rather than the _base_init function.

The autoplugging is now mostly working to the point that a sensible 
looking pipeline appears to be created when I execute:
  gst-launch filesrc location=some.mxf ! spider ! ffcolorspace ! ximagesink
but I get an error:
  GStreamer-WARNING **: push on peer of pad src_0:src but peer is not active

This is confusing me a little as the caps negotiation seems to be 
working fine, as I can run
  gst-launch filesrc location=some.mxf ! mxfdemux ! spider ! 
ffcolorspace ! ximagesink
and everything seems to work Ok.

Does anyone have any suggestions about what I may be doing wrong?  Or 
any pointers to where I can get more information about how the 
autoplugging system works.

Regards,

Mat


Ronald Bultje wrote:

>Hi Matt,
>
>On Fri, 2004-02-06 at 16:40, Mathew Spencer wrote:
>  
>
>>I am currently trying to write an MXF file demuxer with autoplug 
>>capabilities.
>>    
>>
>
>Sounds good!
>
>  
>
>>The problem I am running into is that the src caps for the demultiplexer 
>>are generated dynamicly after the stream metadata has been processed.  
>>This in turn means that the spider thinks that the demux has no src caps 
>>when it is trying to build the pipeline.
>>    
>>
>
>That's not an issue. Spider currently assumes caps are known before
>autoplugging starts; for demuxers, this means that you should set caps
>on pads before adding the pad to the element (that's when autoplugging
>is initiated).
>
>If you first add the pad to the element and then set caps, things go
>wrong. I suppose I should add a note on this to the demux section of the
>PWG...
>
>Ronald
>
>  
>




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