Count frames without loading the entire image

[andreas-eriksson]

Is there a way to count the number of frames inside an animated webp image without loading the entire image and all frames?

The current implementation consumes several gigabytes of memory for animated webp images with many frames.

var image = Image.Load(stream);
var numFrames = image.Frames.Count;

[JimBobSquarePants]

You're looking for Image.Identify(stream)

[andreas-eriksson]

ImageInfo does not seem to contain the number of frames (At least not in version 3) and the imageInfo.FrameMetadataCollection is empty.

[JimBobSquarePants]

Ha! You're right! I need to wire that up properly for WEBP animations. Can you please open an issue?

[andreas-eriksson]

I hope that I am correct in my assumption that FrameMetadataCollection should be populated then?
Let me know if you need an example image.

#2992