Apple Keynote Plays Audio Without Video

http://events.apple.com.edgesuite.net/0901ouabdcaw/event/index.html

I have varying problems with watching Keynote addresses. The worst being video breakup not to mention audio breakup. Frankly I fail to understand why Apple don't allow the video to be downloaded so that you can watch it cleanly rather than waiting for it to buffer and mess around the way it does. It ends up being hopeless to watch because you need significant bandwidth.
Chris

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    Frame rate : 23.976 fps
    Minimum frame rate : 23.810 fps
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    Nominal bit rate : 160 Kbps
    Channel(s) : 2 channels
    Channel positions : L R
    Sampling rate : 48.0 KHz
    Resolution : 16 bits
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