[NTG-context] movie in pdf example in wiki

I try the example to embedded video in wiki, but it doesn't work.

\starttext \externalfigure[./file_server.mov][label=demo,width=4cm,height=4cm,preview=yes] \stoptext

when i execute texexec test.tex it said

TeXUtil | running texmfstart rlxtools --identify /home/weilai/pages/wiki/private/file_server.mov identify: no decode delegate for this image format `/home/weilai/pages/wiki/private/file_server.mov'. RlxTools | unable to identify /home/weilai/pages/wiki/private/file_server.mov TeXExec | runtime: 2.602059

any idea?