Output WEBP image is actually a PNG

[shravan2x]

I'm using this code to convert an input image into WEBP.

await using MemoryStream processedImageMemoryStream = new MemoryStream();
ProcessImageSettings processImageSettings = new ProcessImageSettings()
{
    Width = 0,
    Height = 0,
    ResizeMode = CropScaleMode.Max,
    Interpolation = InterpolationSettings.Lanczos,
    EncoderOptions = new WebpLossyEncoderOptions() { Quality = Math.Clamp(95, 0, 100) }
};
// I tried this, but it makes no difference:
// processImageSettings.TrySetEncoderFormat(ImageMimeTypes.Webp);
MagicImageProcessor.ProcessImage(File.ReadAllBytes("input.webp"), processedImageMemoryStream, processImageSettings);
File.WriteAllBytes("output.webp", processedImageMemoryStream.ToArray());

But this doesn't seem to work as the output image is still a PNG (opening the image in notepad shows the PNG file header clearly). Am I missing something or is this a bug?

[saucecontrol]

processImageSettings.TrySetEncoderFormat(ImageMimeTypes.Webp);

This is the right way to set WebP output, but it's a 'Try' method. You need to check the result to see if it succeeded, in which case you should find that it didn't.

For that method to succeed, you must have a WebP encoder available. On Windows client operating systems, you could install it from Windows Store. On server OS or Linux or for applications running in IIS, you will need a separate codec package. Usage instructions are on the readme tab.