Demuxer?

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Greetings,

I'm a bit of a Noob as far as sound and video goes on Debian.
Sound is pretty well sorted.
I've got alsa working and an OSS wrapper in case it's needed.
I have the xine plug-in for the browser - Iceweasel - which works
because it brings up GXine in the browser when it's initiated. But then
I get a message: "No demuxer found - stream format not recognised".
What variety of animal is a demuxer and what country do I have to go to
to shoot one?
I've looked through the FAQ which seems to be the only on-site
documentation available, but there's no reference to the specific problem.
Anybody got a pointer.
Thanks for any time and trouble.
Regards,

C.
- -- 
The aim of art is to represent not the outward appearance of things,
but their inward significance. -Aristotle
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