(Not sure if this really is a Bug or I am just using the API in a wrong way)

I want to start an animation

• With a MixDuration (but without a previous TrackElement on the same track)
• With a time offset (start the animation at frame X > 0)

What I Did:

• Installed spine-unity-3.8-2019-09-05
• Opened the [2 Controlling Animation] Example Scene
• Modified the DoDemoRoutine() in SpineBeginnerTwo.cs to the following

[Range(0.0f, 1.0f)]
public float offsetRelative = 0.0f;

IEnumerator DoDemoRoutine () 
{
   while (true) {
      // just for better ovservability
      Time.timeScale = 0.2f;   

  // As advised in http://esotericsoftware.com/spine-applying-animations#Empty-animations
  spineAnimationState.SetEmptyAnimation(0, 0);

  // We want to start with an offset (as advised in http://esotericsoftware.com/forum/Is-Spine-Animation-has-cycle-offset-for-looping-animation-6621 )
  var track = spineAnimationState.AddAnimation(0, walkAnimationName, true, 0.0f);
  track.TrackTime       = offsetRelative * track.AnimationEnd;
  track.MixDuration   = 0.01f; //< just for better observability
  yield return new WaitForSeconds(0.2f);

  // Reset to idle
  var track2 = spineAnimationState.AddAnimation(0, idleAnimationName, true, 0);
  track2.MixDuration   = 0.01f; //< just for better observability
  yield return new WaitForSeconds(0.2f);
   }
}

What I expected:

• The Run Animation starting on different frames depending on offsetRelative

What I observe:

• The Run Animation does not consider the offset, I put into TrackTime
• When I change the AddAnimation() calls to SetAnimation() the offset works as expected, but SetAnimation() seems to not support the MixDuration from the EmptyAnimation

Is this a bug or am I doing something wrong?

Sorry if i didn't specify my intends unambiguously:

I don't intent to delay when the animation will be switched.
I just want to say that the animation should start in its middle (as if it had started some seconds ago). (a "cycle offset" as in the forum-thread, i linked to)

(Both suggestions (WaitForSeconds before AddAnimation, passing a positive delay to AddAnimation) lead to a delay of when the animation will be switched (in this case leaving me with the empty animation playing for that time))

(I just used the Sample-Scene-Coroutine so that you can easily reproduce it, my real problem is a bit more complex)

Cool, thanks!