flash actionscript: I'd like to be able to adjust the playback speed of a movie in an .SWF file
using scripting. Perhaps by passing a speed multiplier or divider parameter to
the .SWF file via the FlashVars mechanism of the <object> or <embed> tags. Any
suggestions on how to do this?

You can't adjust the FPS, (well, if you load a movie that has a different frame
rate in _level0, the new frame rate is used BUT you lose everything in higher
levels). However, you can simulate it with setInterval and updateAfterEvent.
Put this code on Frame 1:

MovieClip.prototype.setFPS = function(fps) {
this.clearFPS();
this.stop();
var playIt = function(mc){
mc.nextFrame();
updateAfterEvent();
}
arguments.callee.id = setInterval(playIt, 1000/fps, this);
};

MovieClip.prototype.clearFPS = function() {
if (this.setFPS.id != undefined) {
clearInterval(this.setFPS.id);
delete this.setFPS.id;
}
};

Then, when you want to change (simulate) the fps, use:

MOVIECLIP_INSTANCE_GOES_HERE.setFPS(30); // sets the fps to 30

and when you want to stop:

MOVIECLIP_INSTANCE_GOES_HERE.clearFPS(); // clears the fps

When you clear the fps, the movie will be stopped, so use play() if you want
to continue playing at normal playback speed..

Don't think you can with frame animation, but if it's scripted via an
onEnterFrame event handler you can slow it like so:

var frameCounter:Number = 0;
var frameDivider:Number = 2;

mc.onEnterFrame = function() {
if(frameCounter++ == frameDivider) {
// Do animation
mc.doSomething();

// Reset
frameCounter = 0;
}
};

Hope this helps.



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