[gst-devel] HELP: Link "wavparse" to "audioconvert" has error.

[Freeman Zhang]

Thanks you very much, I understand.

2009/11/2 Tim-Philipp Müller <t.i.m at zen.co.uk>

> On Mon, 2009-11-02 at 19:57 +0800, Freeman Zhang wrote:
>
> > But, why the command line "gst-launch" can handle it?
>
> Ah, sorry, it seems I was a bit too quick and completely misunderstood
> your problem.
>
> The problem is that wavparse's sink pad is a sometimes pad which will be
> added only later when data flow starts (-> 'dynamic pads'). The reason
> for that is that wavparse needs to figure out the type of data first (it
> uses dynamic pads for historical reason related to decodebin/playbin, it
> doesn't strictly have to, but we can't change that now). So there will
> be no sink pad to link to after the element has been created, and you
> will need to do the linking to audioconvert or whatever in a pad-added
> callback later.
>
> Mad's sink pad on the other hand always exists, so you can link it right
> away.
>
> Still, I would recommend you just use uridecodebin/decodebin2/playbin2
> if that's an option.
>
> Cheers
>  -Tim
>
>
>
>
>
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