NO_PREROLL
(NodeRef::NO_START_STOP | NodeRef::NO_SEEK | NodeRef::NO_PREROLL);
f |= (NodeRef::NO_START_STOP | NodeRef::NO_SEEK | NodeRef::NO_PREROLL);
m_flags & NO_PREROLL)
if(m_flags & NodeRef::NO_PREROLL)
ioFlags |= NodeRef::NO_PREROLL;