It would be good to automagically install the necessary gstreamer plugins when we can't decode a file, using GStreamer's missing plugins support much like totem & rhythmbox does. For reference, here's how totem does it: http://svn.gnome.org/viewvc/totem/trunk/src/totem-missing-plugins.h?view=markup http://svn.gnome.org/viewvc/totem/trunk/src/totem-missing-plugins.c?view=markup
*** Bug 14230 has been marked as a duplicate of this bug. ***
This should be fixed in all packages now. At least Youtube properly informs me about missing plugins now.
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