Aw: Re: link demux

[Brendan Long]

On 06/26/2013 01:37 PM, "Simon Krütt" wrote:
>   srcpad = gst_element_get_static_pad (demux, "video_%u");

According to gst-inspect-1.0 qtdemux:
>   SRC template: 'video_%u'
>     Availability: *Sometimes*
>     Capabilities:
>       ANY
You can't use gst_element_get_static_pad on a dynamic pad.

You should probably read this
<http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-pads.html>:
> Some elements might not have all of their pads when the element is
> created. This can happen, for example, with an Ogg demuxer element.
> The element will read the Ogg stream and create dynamic pads for each
> contained elementary stream (vorbis, theora) when it detects such a
> stream in the Ogg stream. Likewise, it will delete the pad when the
> stream ends. This principle is very useful for demuxer elements, for
> example. 
I assume qtdemux works similarly to oggdemux.

You should be able to use g_signal_connect
<https://developer.gnome.org/gobject/stable/gobject-Signals.html#g-signal-connect>
to wait for the "pad-added" signal (its callback will give you the new
pad, just make sure it's a video pad before connecting it).
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