As is usual with mysterious "permission denied" errors, SELinux was the underlying cause. ...
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as
ID Status▲ Resolution Sev Product Comp Assignee▲ Reporter Summary
16008 CLOS NOTA nor Sisyphus mplayer vseleznv imz mplayer and mplayer-gui should require the new version of (libdvdnav?)

File a new bug in the "mplayer" component of the "Sisyphus" product