Well, browing their website, it looks like there isn't a default media player per se, since it's not distributed as a complete desktop environment. Look in their package list, either mplayer or VLC is available for install, though.
Thanks, what I really wanted to know was the Realease Shogo's, (tablet, not picture frame,) OS' default media player, but I figured most people've never heard of it, & it's based off of Angstrom, so, yeah... Thanks, though! :D