【Azure 媒体服务】Media Service的编码示例 -- 创建缩略图子画面的.NET代码调试问题

待我称王封你为后i 2024-03-22 15:18 31阅读 0赞

在中国区Azure上，使用Media Service服务，想要使用.NET的代码来对上传视频创建缩略图(Thumbnail) 。

![c7fa3eb44f01ec17a8bdce1c05408220.png][]

通过官网文档([Azure 媒体服务编码代码示例 | Azure Docs][Azure _ _ Azure Docs])下载.NET示例，配置 appsettings.json 中的参数，运行却出现（Azure.Identity.AuthenticationFailedException: 'ClientSecretCredential authentication failed: AADSTS90002: ）异常。

![bd8aa80491328e783731daf920cf49f7.png][]

> Azure.Identity.AuthenticationFailedException: 'ClientSecretCredential authentication failed: AADSTS90002: Tenant '\*\*\*\*\*\*\*\*-\*\*\*\*-\*\*\*\*-\*\*\*\*-\*\*\*\*\*\*\*\*\*\*\*\*' not found. Check to make sure you have the correct tenant ID and are signing into the correct cloud. Check with your subscription administrator, this may happen if there are no active subscriptions for the tenant.
> 
> Trace ID: 99b963f7-86a5-4cde-a890-8828eff73000
> 
> Correlation ID: 62d4fa3b-92ad-4411-850c-87f562a256b3
> 
> Timestamp: 2023-05-10 07:25:55Z'

## 问题解答 ##

查看.NET项目中的源码，发现获取Credential的代码使用的是 DefaultAzureCredential()。并且 ArmClient 对象也没有指定Azure的运行环境。

![0df5e6b3d93850ec11d3541e048bc7ea.gif][]

![37a69d26a679b830cbdd53c0d47d75c3.gif][]

默认情况下，它们都是指向Global Azure，而非China Azure。

所以，解决当前问题的方法就是在DefaultAzureCredential和ArmClient方法中指定中国区Azure为运行环境。

修改这部分代码为为:

![fa3f6cc18a8c53a04b0c392ea6d6647a.gif][]

var mediaServicesResourceId = MediaServicesAccountResource.CreateResourceIdentifier(
        subscriptionId: options.AZURE_SUBSCRIPTION_ID.ToString(),
        resourceGroupName: options.AZURE_RESOURCE_GROUP,
        accountName: options.AZURE_MEDIA_SERVICES_ACCOUNT_NAME);
    
    DefaultAzureCredentialOptions dacOptions = new DefaultAzureCredentialOptions() { AuthorityHost = AzureAuthorityHosts.AzureChina };
    var credential = new DefaultAzureCredential(dacOptions);
    
    ArmClientOptions armOptions = new ArmClientOptions() { Environment = ArmEnvironment.AzureChina};
    var armClient = new ArmClient(credential, options.AZURE_SUBSCRIPTION_ID.ToString(), armOptions);
    
    var mediaServicesAccount = armClient.GetMediaServicesAccountResource(mediaServicesResourceId);

![de148d6392a80b5f5a4e336294812547.gif][]

注意：使用 **DefaultAzureCredential** 认证，需要设置以下的环境变量

1.  AZURE\_CLIENT\_ID
2.  AZURE\_TENANT\_ID
3.  AZURE\_CLIENT\_SECRET

变量说明： [Azure Identity client library for .NET - Azure for .NET Developers | Microsoft Learn][Azure Identity client library for .NET - Azure for .NET Developers _ Microsoft Learn]

关于DefaultAzureCredential方法获取认证参数的顺序，如下图所示：

![dca6b8dbb0237076b81efc13bbc785fa.png][]

[c7fa3eb44f01ec17a8bdce1c05408220.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/b8224ad296ae4bcaaa2ff01226aaf6a2.png
[Azure _ _ Azure Docs]: https://docs.azure.cn/zh-cn/media-services/latest/samples/samples-encoding-reference#create-a-thumbnail-sprite
[bd8aa80491328e783731daf920cf49f7.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/cb8b618103f841fc94a50a62d89865b4.png
[0df5e6b3d93850ec11d3541e048bc7ea.gif]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/1853848670e74edca23d729989bb9912.png
[37a69d26a679b830cbdd53c0d47d75c3.gif]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/01e368e25f4441b5bc79e41dcaf99252.png
[fa3f6cc18a8c53a04b0c392ea6d6647a.gif]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/8e72cf75d6c848fa8db4ad9ed7bd209e.png
[de148d6392a80b5f5a4e336294812547.gif]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/e0896cacbf904398ab0eaf8fcf30e55c.png
[Azure Identity client library for .NET - Azure for .NET Developers _ Microsoft Learn]: https://learn.microsoft.com/en-us/dotnet/api/overview/azure/identity-readme?view=azure-dotnet#environment-variables
[dca6b8dbb0237076b81efc13bbc785fa.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/36f324a6d4f242659acdc724f2274493.png