Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

ImageSharp version

3.1.1

Other ImageSharp packages and versions

ImageSharp.Web 3.1.0

Environment (Operating system, version and so on)

Windows 11

.NET Framework version

.NET 8

Description

When I saw that animated WebP encoding support landed, I started investigating it ASAP.
Our websites are full of animated GIF images, if we can automatically convert these to WebP using ImageSharp.Web (with acceptable quality) we can potentially save a lot of bandwidth.

On a first glance the quality seems fine, but there one problem. The animation speed of most images is way too high.

Steps to Reproduce

1. Load the attached GIF image with the command format=webp

Images

Image (both original GIF and resulting WebP, I used a .zip file because GitHub does not allow uploading WebP):
aug_2022.zip