Floating point errors calculating keyframe end progress

[aembury7]

Which Version of Lottie are you using?

Lottie 4.4.2

Expected Behavior

Changing between markers without flickering/dropping frames.

To reproduce this issue, simply change from marker "voiceLoop1" to "voiceLoop2" to "voiceLoop3" in a random order.

Please note this was updated in Android here.

Actual Behavior

This is a bug that leads to the wrong keyframe being used due to a floating point rounding error.
Given specific composition start frames and the existing floating point rounding, you could wind up with the following situation:

Keyframe 1 has an endFrame of 48 and an endProgress of 0.095051385
Keyframe 2 has a startFrame of 48 and a startProgress of 0.09505139

Animation JSON

Please find attached.
DemoVoice.json

[calda]

When I test this animation locally, cycling randomly through the three markers, I don't see any flickering:

Screen.Recording.2024-12-05.at.9.55.02.AM.mov

For us to investigate further you'd need to share a sample Xcode project that demonstrates the flickering issue.

For reference, this is how I set up the looping:

.playbackMode(playbackMode)
.animationDidFinish { completed in
  marker = ["voiceLoop1", "voiceLoop2", "voiceLoop3"].filter { $0 != marker }.randomElement()!
}

@State private var marker = ["voiceLoop1", "voiceLoop2", "voiceLoop3"].randomElement()!

private var playbackMode: LottiePlaybackMode {
  .playing(.marker(marker, loopMode: .playOnce))
}

[github-actions]

This issue is stale because it is marked "can't reproduce" and has had no activity in the past week. Please comment with additional information, or this issue will be closed due to inactivity in one week.