(H.263) with MPEG 1 Layer III audio (Score 1)

I'd do (H.263) with MPEG 1 Layer III audio ;). Mac = QT Windows = Windows Media Player 8+ (I believe or maybe it was 9?) Linux = mplayer Newer Mac/Windows side should be able to play it with default applications. I can imagine most Linux distros also come with mplayer also.