如何使用 Logic APP 自动下载视频的脚本（VTT 文件）？

Question

我使用逻辑应用程序将几个视频编入索引 videoindexer.ai。但我想知道，有没有办法使用逻辑应用程序下载 VTT 格式的成绩单文件并将它们放在 Onedrive 文件夹中？没有看到有关如何通过逻辑应用完成此操作的文档。

Azure 函数：

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System.Net.Http.Headers;
using System.Text;
using System.Net.Http;
using System.Web;

namespace TranscriptVtt
{
    public static class Function1
    {
        [FunctionName("Function1")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            var client = new HttpClient();
            var queryString = HttpUtility.ParseQueryString(string.Empty);

            // Request headers
            client.DefaultRequestHeaders.Add("x-ms-client-request-id", "");
            client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", "{subscription key}");

            // Request parameters
            queryString["indexId"] = "{string}";
            queryString["format"] = "Vtt";
            queryString["language"] = "{string}";
            queryString["accessToken"] = "{string}";
            var uri = "https://api.videoindexer.ai/{location}/Accounts/{accountId}/Videos/{videoId}/Captions?" + queryString;
            var response = await client.GetAsync(uri);
            return new OkObjectResult("VTT Processed");
        }
    }
}

Answer 1

直接使用 Logic App 连接器我不认为这是可能的，但你可以直接使用 REST API。执行请求，并根据响应，添加一个新任务，该任务将成为 onedrive 连接器：

https://docs.microsoft.com/en-us/azure/connectors/connectors-native-http

https://docs.microsoft.com/en-us/connectors/onedrive/

休息 API:

curl -v -X GET "https://api.videoindexer.ai/{location}/Accounts/{accountId}/Videos/{videoId}/Captions?indexId={string}&format=Vtt&language={string}&accessToken={string}"
-H "x-ms-client-request-id: "
-H "Ocp-Apim-Subscription-Key: {subscription key}"

--data-ascii "{body}"

编辑：等效的 int c#。您需要在 Web 服务器上使用它（Azure Functions 会很棒）：

using System;
using System.Net.Http.Headers;
using System.Text;
using System.Net.Http;
using System.Web;

namespace CSHttpClientSample
{
    static class Program
    {
        static void Main()
        {
            MakeRequest();
            Console.WriteLine("Hit ENTER to exit...");
            Console.ReadLine();
        }

        static async void MakeRequest()
        {
            var client = new HttpClient();
            var queryString = HttpUtility.ParseQueryString(string.Empty);

            // Request headers
            client.DefaultRequestHeaders.Add("x-ms-client-request-id", "");
            client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", "{subscription key}");

            // Request parameters
            queryString["indexId"] = "{string}";
            queryString["format"] = "Vtt";
            queryString["language"] = "{string}";
            queryString["accessToken"] = "{string}";
            var uri = "https://api.videoindexer.ai/{location}/Accounts/{accountId}/Videos/{videoId}/Captions?" + queryString;

            var response = await client.GetAsync(uri);
        }
    }
}

您需要在工作流程中传递对 Onedrive 任务的响应。

https://api-portal.videoindexer.ai/docs/services/operations/operations/Get-video-captions

Answer 2

我通过执行以下操作（并且有效）做了一个快速演示：

用于视频上传的 LogicApp #1：触发一个 OneDrive“输入”文件夹，并将视频上传到视频索引器以进行索引
结果 collection 的 LogicApp #2：将通过索引调用的 http 触发器，然后获取字幕并在 OneDrive“输出”文件夹中创建一个文件。

诀窍在于，如 Upload Video 视频索引器操作（参见 here）中所述，您可以添加回调：

如您所见，此回调会将视频的 ID 添加到查询字符串中。

因此，在您的 LogicApp #2 中，在视频索引器的 Get Video Captions 操作中使用此 id：

获取id的表达式为triggerOutputs()['queries']['id'].

然后你只需要复制到你的输出：

我使用了基于视频 ID 的命名：concat(triggerOutputs()['queries']['id'],'-Captions.vtt')

它有效：

为了获得更好的实现，您应该添加一个检查以过滤由于上述面部检测而产生的回调。这可以通过过滤 'State' 查询字符串值来完成。

这是我的 LogicApp #2 的代码（带有一些隐藏字段）：

{
    "definition": {
        "$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
        "actions": {
            "Create_file": {
                "inputs": {
                    "body": "@body('Get_Video_Captions')",
                    "host": {
                        "connection": {
                            "name": "@parameters('$connections')['onedrive']['connectionId']"
                        }
                    },
                    "method": "post",
                    "path": "/datasets/default/files",
                    "queries": {
                        "folderPath": "/LogicAppsDemo/VideoIndexing/Output",
                        "name": "@{concat(triggerOutputs()['queries']['id'],'-Captions.vtt')}"
                    }
                },
                "runAfter": {
                    "Get_Video_Captions": [
                        "Succeeded"
                    ]
                },
                "runtimeConfiguration": {
                    "contentTransfer": {
                        "transferMode": "Chunked"
                    }
                },
                "type": "ApiConnection"
            },
            "Get_Account_Access_Token": {
                "inputs": {
                    "host": {
                        "connection": {
                            "name": "@parameters('$connections')['videoindexer-v2']['connectionId']"
                        }
                    },
                    "method": "get",
                    "path": "/auth/@{encodeURIComponent('##VI-REGION##')}/Accounts/@{encodeURIComponent('##VI-ACCOUNT##')}/AccessToken",
                    "queries": {
                        "allowEdit": false
                    }
                },
                "runAfter": {},
                "type": "ApiConnection"
            },
            "Get_Video_Captions": {
                "inputs": {
                    "host": {
                        "connection": {
                            "name": "@parameters('$connections')['videoindexer-v2']['connectionId']"
                        }
                    },
                    "method": "get",
                    "path": "/@{encodeURIComponent('##VI-REGION##')}/Accounts/@{encodeURIComponent('##VI-ACCOUNT##')}/Videos/@{encodeURIComponent(triggerOutputs()['queries']['id'])}/Captions",
                    "queries": {
                        "accessToken": "@body('Get_Account_Access_Token')",
                        "format": "vtt",
                        "language": "English"
                    }
                },
                "runAfter": {
                    "Get_Account_Access_Token": [
                        "Succeeded"
                    ]
                },
                "type": "ApiConnection"
            }
        },
        "contentVersion": "1.0.0.0",
        "outputs": {},
        "parameters": {
            "$connections": {
                "defaultValue": {},
                "type": "Object"
            }
        },
        "triggers": {
            "manual": {
                "inputs": {
                    "method": "POST",
                    "schema": {}
                },
                "kind": "Http",
                "type": "Request"
            }
        }
    },
    "parameters": {
        "$connections": {

            "value": {
                "onedrive": { ... },
                "videoindexer-v2": { ... }
            }
        }
    }
}

顺便说一下，您的 use-case 几乎在 Microsoft 的博客 post 中有所描述（他们在这里获取索引，而不是标题）：https://azure.microsoft.com/en-us/blog/logic-apps-flow-connectors-will-make-automating-video-indexer-simpler-than-ever/

如何使用 Logic APP 自动下载视频的脚本（VTT 文件）？

How Can I automatically download a Transcript (VTT file) of a video using a Logic APP?

azure

azure-functions

azure-logic-apps

azure-cognitive-services