WebPEncoder overlays all Frames

[AaronMaria]

It works in creating the animated WebP, but each Frame seems to include all previous Frames. Can you tell me if I did something wrong, here is a snippet:

  drawable = ApngDrawable.decode(getInputStream(uri))
  val encoder = WebPEncoder()
  for (frameNum in 0 until drawable.frameCount) {
      drawable.seekToFrame(0, frameNum)
      var frame = scaleToAlternative(drawableToBitmap(drawable.current)!!, 512, 512, 16)
      encoder.addFrame(frame, 0, 0, drawable.frameDurations[frameNum])
  }
  createFile(encoder.build(), path)

I try to create an animated WebP from an APNG.

[AaronMaria]

I got it, disposal seems to be off by default

[penfeizhou]

Yes,it's a simple translation. If you need more adavanced usage for better performance or compression,please see https://developers.google.com/speed/webp/download.