I can confirm this behavior with the stock ubuntu version of miro on Lucid.
miro | 2.5.3-1ubuntu1 | http://us.archive.ubuntu.com lucid/universe
Sources
** Changed in: miro (Ubuntu)
Importance: Undecided => Medium
** Changed in: miro (Ubuntu)
Status: New => Confirmed
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miro doesn't disable screen saver while playing
https://bugs.launchpad.net/bugs/302135
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