[Bug 738416] decodebin: Fix autoplugging of parser elements

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738416
  GStreamer | gst-plugins-base | git

--- Comment #8 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-10-20 11:47:06 UTC ---
It makes debugging from our side more difficult though. We wouldn't have to
only ask about which decoder people are using, but also about the parsers.

In any case, for this to be acceptable
- make a GST_DEBUG_OBJECT() in decodebin if there is more than one parser
- prefer Parser/Converter over plain Parser
- only plug one parser in a chain for the same format, i.e. allow multiple
parsers if somewhere the caps have changed from the first to the second parser.
I think an elegant way of doing that is by just not plugging multiple parsers
in a row, but if the previous element is not a parser just add one again if
needed

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