mpeg2 stream listening problem with VLC on angstrom


I downloaded and installed vlc with "opkg install vlc" from angstrom
repository. But while I am trying to play mpeg2 stream, vlc is trying
to play and trying to show video. But whole screen is gray and audio
doesn't come. is there anyone who has got an information about this
problem? May be a codec problem or vlc isn't working on angstrom
properly but I don't know how to fix it.

I am using BeagleBoard XM revision B and angstrom demo image is 2011.1
at I have
upgraded whole package but vlc has problem again.