When load an animated webp image throws "SixLabors.ImageSharp.ImageFormatException: Unexpected chunk followed VP8X header" exception.

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

2.1.2

Other ImageSharp packages and versions

SixLabors.ImageSharp.Drawing 1.0.0-beta14; Sixlabors.Fonts 1.0.0-beta17

Environment (Operating system, version and so on)

Win10 21H2

.NET Framework version

.net 5.0.402

Description

https://mathiasbynens.be/demo/animated-webp-supported.webp

I have seen the feature support PR, but I still cannot load animated webp images. Maybe the method I used is wrong.

Steps to Reproduce

download the example image
load with code

Image img = Image.Load(@"1.webp");

then exception throws.

Unhandled exception. SixLabors.ImageSharp.ImageFormatException: Unexpected chunk followed VP8X header
   at SixLabors.ImageSharp.Formats.Webp.WebpThrowHelper.ThrowImageFormatException(String errorMessage)
   at SixLabors.ImageSharp.Formats.Webp.WebpDecoderCore.ReadVp8XHeader()
   at SixLabors.ImageSharp.Formats.Webp.WebpDecoderCore.ReadVp8Info()
   at SixLabors.ImageSharp.Formats.Webp.WebpDecoderCore.Decode[TPixel](BufferedReadStream stream, CancellationToken cancellationToken)
   at SixLabors.ImageSharp.Formats.ImageDecoderUtilities.Decode[TPixel](IImageDecoderInternals decoder, Configuration configuration, Stream stream, Func`3
largeImageExceptionFactory, CancellationToken cancellationToken)
   at SixLabors.ImageSharp.Formats.ImageDecoderUtilities.Decode[TPixel](IImageDecoderInternals decoder, Configuration configuration, Stream stream, Cancell
ationToken cancellationToken)
   at SixLabors.ImageSharp.Formats.Webp.WebpDecoder.Decode[TPixel](Configuration configuration, Stream stream, CancellationToken cancellationToken)
   at SixLabors.ImageSharp.Formats.Webp.WebpDecoder.Decode(Configuration configuration, Stream stream, CancellationToken cancellationToken)
   at SixLabors.ImageSharp.Image.Decode(Stream stream, Configuration config, CancellationToken cancellationToken)
   at SixLabors.ImageSharp.Image.<>c__DisplayClass134_0.<Load>b__0(Stream s)
   at SixLabors.ImageSharp.Image.WithSeekableStream[T](Configuration configuration, Stream stream, Func`2 action)
   at SixLabors.ImageSharp.Image.Load(Configuration configuration, Stream stream, IImageFormat& format)
   at SixLabors.ImageSharp.Image.Load(Configuration configuration, String path, IImageFormat& format)
   at SixLabors.ImageSharp.Image.Load(Configuration configuration, String path)
   at SixLabors.ImageSharp.Image.Load(String path)
   at BilibiliMonitor.Program.Main(String[] args) in E:\编程\程序c#\BilibiliMonitor\BilibiliMonitor\Program.cs:line 19

Images

Decoding animated webp images is not supported in 2.1.2, but the error message is wrong though. The expected error message should have been NotSupportedException, but the ANIM chunk is not recognized as an optional VP8X chunk.

The error does not occur in main. Decoding animated webp images was added recently with #1985. For missing webp features see #1802.

You can try our nightly build to verify that.

Decoding animated webp images is not supported in 2.1.2, but the error message is wrong though. The expected error message should have been NotSupportedException, but the ANIM chunk is not recognized as an optional VP8X chunk.

The error does not occur in main. Decoding animated webp images was added recently with #1985. For missing webp features see #1802.

You can try our nightly build to verify that.

Thank you. I tried the nightly build and the program successfully loaded the animated webp image. Hope this feature be added to stable branch soon. Thanks for all your work.

Fix #2154

Merge pull request #2157 from SixLabors/backport/2135-2154

i came into a different problem,as i uploaded the animated webp image above using 3.0.1(Sixlabor.ImageSharp.dll),and finally called saveAsync ,it produced a static webp which had just one frame.
By debugging,it showed that the Image instance as a result of Image.Load(byte[]),had a Frames property eqauled to 1.
What might be the reason?thank you for your answer^_^

i came into a different problem,as i uploaded the animated webp image above using 3.0.1(Sixlabor.ImageSharp.dll),and finally called saveAsync ,it produced a static webp which had just one frame.

Then why did you comment on this closed issue?

i came into a different problem,as i uploaded the animated webp image above using 3.0.1(Sixlabor.ImageSharp.dll),and finally called saveAsync ,it produced a static webp which had just one frame.

Then why did you comment on this closed issue?

sorry,i should create a new one..

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When load an animated webp image throws "SixLabors.ImageSharp.ImageFormatException: Unexpected chunk followed VP8X header" exception. #2154

Prerequisites

ImageSharp version

Other ImageSharp packages and versions

Environment (Operating system, version and so on)

.NET Framework version

Description

Steps to Reproduce

Images

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When load an animated webp image throws "SixLabors.ImageSharp.ImageFormatException: Unexpected chunk followed VP8X header" exception. #2154

Description

Prerequisites

ImageSharp version

Other ImageSharp packages and versions

Environment (Operating system, version and so on)

.NET Framework version

Description

Steps to Reproduce

Images

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brianpopow commented on Jun 16, 2022

Hellobaka commented on Jun 16, 2022

marshafan commented on Aug 29, 2023

JimBobSquarePants commented on Aug 29, 2023

marshafan commented on Aug 29, 2023

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