Message-ID: <D619B80700D24282BA5B65FD13174B62@HPZ200>
From: "Dan Ebberts" <debberts@comcast.net>
To: "After Effects Mail List" <AE-List@media-motion.tv>
References: <list-4942959@media-motion.tv>
In-Reply-To: <list-4942959@media-motion.tv>
Subject: Re: [AE] speed change expression
Date: Sun, 6 Jan 2013 14:38:19 -0800
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Importance: Normal

If you add a slider to the clip and use linear keyframes (important) to set 
the speeds (in percent), this time remapping expression should work:

spd = effect("Slider Control")("Slider");
n = spd.numKeys;
if (n > 0 && spd.key(1).time < time){
  accum = spd.key(1).value*(spd.key(1).time - inPoint);
  for (i = 2; i <= n; i++){
    if (spd.key(i).time > time) break;
    k1 = spd.key(i-1);
    k2 = spd.key(i);
    accum += (k1.value + k2.value)*(k2.time - k1.time)/2;
  }
  accum += (spd.value + spd.key(i-1).value)*(time - spd.key(i-1).time)/2;
}else{
  accum = spd.value*(time - inPoint);
}
value + accum/100

If you can't use linear keyframes, you're probably stuck with something like 
the slower method described here:

http://www.motionscript.com/articles/speed-control.html#frame-by-frame

Dan

-----Original Message----- 
From: henry birdseye
Sent: Sunday, January 06, 2013 2:27 PM
To: After Effects Mail List
Subject: Re: [AE] speed change expression

Thanks, Jack, but that's the thing... I don't want to have to cut up the
clips, just keyframe their varying speeds.


On 1/6/2013 5:07 PM, Jack Tunnicliffe wrote:
> Not sure I'm understanding you completely, you can choose to just open 
> time stretch and enter any percentage speed change. If this happens 
> several times on the clip just cut it up and apply your new percentage to 
> each clip.
>
> Jack Tunnicliffe
> Java Post Production
> www.javapost.ca
>
>
>
> On Jan 6, 2013, at 4:03 PM, henry birdseye <henry.birdseye@gmail.com> 
> wrote:
>
>> I'm looking for an expression that would let me change the playback speed 
>> of a clip with a percentage instead of keyframed values of Time Remap. 
>> Has anyone done this before?
>>
>> Tx in advance.
>>
>> HB
>>
>>
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