Animation speed change?

Question

2D

In the game, you need to change the animation speed in accordance with the running speed, when I change the frameDuration - the animation twitches, I tried to change it on the zero frame - the same thing, how to deal with it?
libgdx

Answer 1

mb someone will need
if (needToSetDuration && animation.getKeyFrameIndex(stateTime)==0){
animation.setFrameDuration(animation.getFrameDuration()-0.001f);
stateTime=0;
needToSetDuration=false;
}