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Activity Forums Adobe After Effects Expressions Another little problem with my program.

  • Another little problem with my program.

    Posted by Kex Moderc on January 25, 2013 at 6:18 pm

    So you have already solved me one glitch, but I have another.
    Look at the slider. When I keyframe couple bpm values, the graph glitches. Goes a little back, a little foward.
    I want a smooth transitions between different bpm values.
    so lets say I have one keyframe to 60 and another 90.
    In meanwhile it smoothly accelerates to 90.
    I hope you know what I mean.
    I really don`t know what is wrong here.
    5305_help1.aep.zip

    Kex Moderc replied 13 years, 3 months ago 2 Members · 4 Replies
  • 4 Replies
  • Dan Ebberts

    January 25, 2013 at 7:39 pm

    Changing an expression’s speed is complicated. Instead of using bps, you need to calculate the total elapsed beats and use that in your calculation. You can use the method described here:

    https://www.motionscript.com/articles/speed-control.html#linear

    Dan

  • Kex Moderc

    January 25, 2013 at 10:03 pm

    So lets say I have to deal with multiple 10-20min graph projecting with continious bpm change. I guess the method you showed me wouldn’t be good for that.
    Any other idea? Btw thanks Dan for helping this out.

  • Dan Ebberts

    January 25, 2013 at 10:59 pm

    I would first just try it and see how far it gets before you notice a real performance hit. Since it doesn’t have to look at each previous frame (just each previous keyframe) it might not be too bad. If it bogs down too much, maybe you could break it into smaller chunks.

    Dan

  • Kex Moderc

    February 1, 2013 at 2:09 pm

    So I have been playing with the tutorial on your page for a few days, but currently I haven`t found the way up.
    Can you just make me a beggining of a program or just a little scratch so that I could then continue and finish it.

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