[Bug 634407] decodebin2 should expose pads in a deterministic order

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=634407
  GStreamer | gst-plugins-base | unspecified

--- Comment #17 from René Stadler <mail at renestadler.de> 2011-12-17 22:41:47 UTC ---
Hmm, a pad-unique string identifier that is stable across invocations... The
pad name should already satisfy that in 99% of all cases, right? :)

Now I want a different approach; how about we discover the pipeline's topology,
restricted to a subset of elements we are interested in? Probably just looking
at all elements with a 1-to-N topology, or looking at the factory
classification for "Demuxer".

The benefit is that no changes to elements are required at all. Well, except
for weird (and rare?) cases where e.g. audio_00 and audio_01 can be confused
randomly, which just needs fixing.

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