mplayer branches explanation?

[A Mennucc]

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hi Reinhard

I see there are a lot of branches in our mplayer GIT

may please explain their intended usage?
(just to be sure, so that we all can interact with those understanding
the semantic)

* master
  origin/HEAD
  origin/master
  origin/master.unstripped
  origin/pristine-tar
  origin/upstream
  origin/upstream.unstripped

a.
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