Flash Player isn't a video player per-se. It's a language runtime. So while you can write a video player on top of it, it's not like you can just drag a video in or something.

Flash Player supports H.264 video, On2 VP6 and Sorenson. The H.264 codec is really the only thing you want to use, and would typically be packaged as .mp4 or m4v. We support a whole array of other more sophisticated streaming video formats, but those features are mainly aimed at premium video content providers like MLB, HBO, Comcast, etc. and require both client and server-side support.

There's lots of documentation online about that, but as far as I can tell, my browser is playing this video directly and not using Flash Player. This problem you're describing is typically related to video drivers, and you might try disabling hardware acceleration in your browser to see if that helps. If it does, you need to update your GPU drivers, then try turning it back on. If it persists, you should file a bug with your GPU vendor, with repro instructions.

Hope that helps...

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