pdf in beamer - from portrait and back zu landscape

[Uwe Ade]

hello,

i want put a pdf- file in my beamer presentation. this works with including the 
following ERT


\setbeamercolor{background canvas}{bg=}
\includepdf[pages=1-4,landscape=flase] {pdf/test.pdf}

it works in the way i want. the four pdf sides in portrait-mode. At the end of 
the pdf document the following beamer slides also in portrait- mode. 

are there any command to bring the beamer slides back in landscape mode?

thanks 

uwe