Ah, I figured it out now. Seems it wasn't so simple, and I just got lucky without realizing it: Two tabs, one to MLB.com's multimedia page, and the other to the cubs' multimedia page (which is different): http://chicago.cubs.mlb.com/mediacenter/index.jsp?c_id=chc. I was able to open the video from one and the audio from the other, presumably because they were from (sort of) different sites. And I'm using Firefox, FWIW. Might not work with IE, haven't tried.