Cannot load animated avif images.

[GoldenGuy]

Magick.NET version

13.5.0

Environment (Operating system, version and so on)

Win10 pro 22H2 x64

Description

i am able to load static avif/heic imageges, but any animated image i tried i got this exception:

Unhandled exception. ImageMagick.MagickMissingDelegateErrorException: no decode delegate for this image format `' @ error/blob.c/CustomStreamToImage/810
   at ImageMagick.NativeInstance.CheckException(IntPtr exception, IntPtr result) in /_/src/Magick.NET/Native/NativeInstance.cs:line 57
   at ImageMagick.MagickImage.NativeMagickImage.ReadStream(IMagickSettings`1 settings, ReadWriteStreamDelegate reader, SeekStreamDelegate seeker, TellStreamDelegate teller) in /_/src/Magick.NET/Native/MagickImage.cs:line 7037
   at ImageMagick.MagickImage.Read(Stream stream, IMagickReadSettings`1 readSettings, Boolean ping) in /_/src/Magick.NET/MagickImage.cs:line 7635
   at ImageMagick.MagickImage.Ping(Stream stream, IMagickReadSettings`1 readSettings) in /_/src/Magick.NET/MagickImage.cs:line 4549
   at ImageMagick.MagickImageInfo.Read(Stream stream, IMagickReadSettings`1 readSettings) in /_/src/Magick.NET/MagickImageInfo.cs:line 406
   at ImageMagick.MagickImageInfo..ctor(Stream stream, IMagickReadSettings`1 readSettings) in /_/src/Magick.NET/MagickImageInfo.cs:line 133
   at ImageMagick.MagickImageInfo..ctor(Stream stream) in /_/src/Magick.NET/MagickImageInfo.cs:line 121
   at TwitchChat.ImageDownloader.DownloadImage(String name, String url) in D:\VS\TwitchChat\ImageDownloader.cs:line 42
   at TwitchChat.Program.Main(String[] args) in D:\VS\TwitchChat\Program.cs:line 67
   at TwitchChat.Program.<Main>(String[] args)

Steps to Reproduce

here is my code

byte[] imageData = await httpClient.GetByteArrayAsync(url);
using (MemoryStream inputStream = new MemoryStream(imageData))
{
	var info = new ImageMagick.MagickImageInfo(inputStream);
	Console.WriteLine($"format: {info.Format}");
}

test images i used are these:
https://github.com/colinbendell/webperf/tree/master/animated-gif-decode
and these:
https://github.com/link-u/avif-sample-images

[dlemstra]

It looks like animated avif images are not yet supported by the library that is being used in this project: strukturag/libheif#377.

[GoldenGuy]

Maybe libavif could be used for this? Doesnt seem like there is any progress in libheif to add support for animated avis...

[dlemstra]

That library is being used by libheif to read avif files.