Azure 媒体播放器如何获取播放器的源 url

Question

我有一个 Azure 媒体服务帐户，其中包含一些已上传的视频，但这些视频只能在浏览器上播放，并带有一些附加参数，例如 (?sv=2017-04-17&sr=c&sig=QMSr...)身份验证密钥。我想要一个可以随时播放的通用永久渐进式视频 URL，我尝试将 azure 媒体播放器与我的视频 URLs 一起使用 .ism/manifest 和 .mp4 但两者都不能被播放经验值：

https://<MY_BLOBSTORAGE_ACCOUNT>.blob.core.windows.net/<Asset-ID>/Video_FILE_NAME>.ism/manifest

https://<MY_BLOBSTORAGE_ACCOUNT>.blob.core.windows.net/<Asset-ID>/<Video_FILE_NAME>_1280x720_AACAudio.mp4

我试过微软官方文档中的播放器： http://amp.azure.net/libs/amp/latest/docs/index.html#full-setup-of-azure-media-player

另请注意，Azure Media Services V3 文档和 ams 社区本身在解释以编程方式获取播放器视频 url 的步骤方面非常薄弱。

Answer 1

您似乎混合了渐进式下载和流式传输。我在 https://blogs.msdn.microsoft.com/randomnumber/2016/03/23/progressive-download-and-streaming-differences-with-azure-media-services/. If you encoded the video into an adaptive bitrate MP4 set then more than likely you'll want to stream the video instead of using progressive download on a single MP4. This might help with the streaming side: https://docs.microsoft.com/en-us/azure/media-services/latest/dynamic-packaging-overview

上写了一篇关于 Azure 媒体服务差异的博客 post

Answer 2

使用 AMS v3，您必须创建一个流式定位器，并且可以使用预建的流式传输策略。有针对的政策 - 仅流媒体 - 流媒体和下载 - 仅下载

使用下载策略，您将获得资产中每个 blob 的 URL。例如： https://myaccount-uswc.streaming.media.azure.net/1544fcae-a248-4f53-b653-cd02074b04b6/video_848x480_2200.mp4

使用流媒体策略（推荐），您将获得 DASH、HLS 和 Smooth URL，例如： https://myaccount-uswc.streaming.media.azure.net/0eef6f88-47c6-4662-9111-60305d7c1000/video.ism/manifest(format=mpd-time-csf).mpd

Answer 3

我在朋友的帮助下找到了解决方案，在创建流媒体定位器之后，我必须确保流媒体端点是运行，然后通过遍历我需要获取的路径来获取构建 URL使用 StreamingLocators.ListPathsAsync，下面是代码片段。

        private async Task<StreamingLocator> CreateStreamingLocatorAsync(
            IAzureMediaServicesClient client,
            string resourceGroup,
            string accountName,
            string assetName,
            string locatorName)
        {
            StreamingLocator locator = await client.StreamingLocators.CreateAsync(
                resourceGroup,
                accountName,
                locatorName,
                new StreamingLocator
                {
                    AssetName = assetName,
                    StreamingPolicyName = PredefinedStreamingPolicy.ClearStreamingOnly
                });

            return locator;
        }

        private async Task<IList<string>> GetStreamingUrlsAsync(
            IAzureMediaServicesClient client,
            string resourceGroupName,
            string accountName,
            String locatorName)
        {
            const string DefaultStreamingEndpointName = "default";

            IList<string> streamingUrls = new List<string>();

            StreamingEndpoint streamingEndpoint = await client.StreamingEndpoints.GetAsync(resourceGroupName, accountName, DefaultStreamingEndpointName);

            if (streamingEndpoint != null)
            {
                if (streamingEndpoint.ResourceState != StreamingEndpointResourceState.Running)
                {
                    await client.StreamingEndpoints.StartAsync(resourceGroupName, accountName, DefaultStreamingEndpointName);
                }
            }

            ListPathsResponse paths = await client.StreamingLocators.ListPathsAsync(resourceGroupName, accountName, locatorName);

            foreach (StreamingPath path in paths.StreamingPaths)
            {
                UriBuilder uriBuilder = new UriBuilder();
                uriBuilder.Scheme = "https";
                uriBuilder.Host = streamingEndpoint.HostName;

                uriBuilder.Path = path.Paths[0];
                streamingUrls.Add(uriBuilder.ToString());
            }

            return streamingUrls;
        }

在我的服务方法中，我执行以下操作：

StreamingLocator locator = await CreateStreamingLocatorAsync(client,
config.ResourceGroup, config.AccountName, outputAsset.Name, locatorName);

IList<string> streamingUrls = await GetStreamingUrlsAsync(client, config.ResourceGroup, config.AccountName, locator.Name);
foreach (var url in streamingUrls)
   {
       urls.Add(url);
       Console.WriteLine(url);
   }
myModel.StreamingUrls = urls;

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