the speed in frames per second, or "slowest", "slower", "slow", "normal", "fast", "faster", "fastest".
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Set the playing speed for the next (and only the next) playVideo command. The speed is specified in frames per second (30 frames per second being normal speed), or by keyword.
Note: not all players can play at any speed. It is generally best to use the keywords since they are always translated to a speed the player can actually play.