[gst-devel] sending extra data along with buffers

[Edward Hervey]

Also forgot, doing it that way, if you have a element creating those
extra metadata but you don't want to use them, you just don't connect to
that metadata pad, which minimizes the overload of that metadata in the
whole pipeline



On Mon, 2008-01-14 at 11:27 +0100, Edward Hervey wrote:
> Hi,
> 
>   Another aproach would be to have a second stream for your metadata :)
> 
>   It gives you the added bonus of
>   * being able to use the non-modified (audio or video) stream with
> existing plugins, 
>   * be able to modify, if needed, your metadata stream with new elements
> that know how to handle it
>   * create/modify elements that need both streams (using timestamps of
> buffer to correlate the raw buffers to the associated metadata
>   * Not modifying GStreamer core for this
> 
>     Edward
> 
> On Mon, 2008-01-14 at 10:05 +0100, Stefan Kost wrote:
> > hi,
> > 
> > I am looking for a way to send some private data along with a buffer.  
> > During data capture I get some metadata about capture settings and I  
> > would like to store/analyze them later along with the data stream. I  
> > tried to add a payload item to caps and put a GstBuffer there. But  
> > this seems to be painful and I am afraid that it will cause  
> > renegotiation as the content changes for each buffer. Has anyone been  
> > doing something similar?
> > 
> > alternative (better approach) seems to be using a buffer subclass, right?
> > 
> > Attached is my current test. Its a bit hackish and fails. One thing I  
> > was wondering is that fakesrc send buffer with caps=NULL. A bug?
> > 
> > Stefan
> > 
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