message: Report that animated webp is not supported for now.
diff: @@ -126,6 +126,8 @@ bool WebPDecoder::readHeader()
  WebPBitstreamFeatures features;
  if (VP8_STATUS_OK == WebPGetFeatures(header, sizeof(header), &features))
  {
  + CV_CheckEQ(features.has_animation, false, "WebP backend does not support animated webp images");
  +
  m_width = features.width;
  m_height = features.height;
  