[Bug 649542] element ranking customization

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=649542
  GStreamer | gstreamer (core) | 0.10.32

--- Comment #10 from David Schleef <ds at schleef.org> 2011-05-10 21:27:18 UTC ---
I am against adding any kind of rank adjustment system until after we fix the
ranks.

At some point, I had a patch that read rank adjustment information from an
environment variable.  I stopped using it because it adjusted ranks when
*building* the registry rather than *reading* the registry, but otherwise it
worked quite well.

IMO, ranks for decoders and parsers should be adjusted as follows (starting
from PRIMARY, assuming they're PRIMARY quality):

  -10  all parsers
  -20  decoders without built-in parsers
  +2   decoders from an external source (because you had to go and get them,
thus you presumably want to use them)
  +4   decoders that you paid for (same, but even more so)

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