How to: Deliver an asset by download

---

Warning

Update your Azure Media Services REST API and SDKs to v3 by 29 February 2024. Version 3 of Azure Media Services REST API and client SDKs for .NET and Java offers more capabilities than version 2. We’re retiring version 2 of the Azure Media Services REST API and client SDKs for .NET and Java.

Action Required: To minimize disruption to your workloads, review the migration guide to transition your code from the version 2 API and SDKs to version 3 API and SDK before February 29th, 2024. After February 29th, 2024, Azure Media Services will no longer accept traffic on the version 2 REST API, the ARM account management API version 2015-10-01, or from the version 2 .NET client SDKs. This includes any 3rd party open-source client SDKS that may call the version 2 API. Learn about the latest version, starting with the Media Services v3 Overview.

This article discusses options for delivering media assets uploaded to Media Services. You can deliver Media Services content in numerous application scenarios. After encoding, download the generated media assets, or access them by using a streaming locator. For improved performance and scalability, you can also deliver content by using a Content Delivery Network (CDN).

This example shows how to download media assets from Media Services to your local computer. The code queries the jobs associated with the Media Services account by job ID and accesses its OutputMediaAssets collection (which is the set of one or more output media assets that results from running a job). This example shows how to download output media assets from a job, but you can apply the same approach to download other assets.

Note

There is a limit of 1,000,000 policies for different AMS policies (for example, for Locator policy or ContentKeyAuthorizationPolicy). Use the same policy ID if you are always using the same days / access permissions, for example, policies for locators that are intended to remain in place for a long time (non-upload policies). For more information, see this article.

    // Download the output asset of the specified job to a local folder.
    static IAsset DownloadAssetToLocal( string jobId, string outputFolder)
    {
        // This method illustrates how to download a single asset.
        // However, you can iterate through the OutputAssets
        // collection, and download all assets if there are many.

        // Get a reference to the job.
        IJob job = GetJob(jobId);

        // Get a reference to the first output asset. If there were multiple
        // output media assets you could iterate and handle each one.
        IAsset outputAsset = job.OutputMediaAssets[0];

        // Create a SAS locator to download the asset
        IAccessPolicy accessPolicy = _context.AccessPolicies.Create("File Download Policy", TimeSpan.FromDays(30), AccessPermissions.Read);
        ILocator locator = _context.Locators.CreateLocator(LocatorType.Sas, outputAsset, accessPolicy);

        BlobTransferClient blobTransfer = new BlobTransferClient
        {
            NumberOfConcurrentTransfers = 20,
            ParallelTransferThreadCount = 20
        };

        var downloadTasks = new List<Task>();
        foreach (IAssetFile outputFile in outputAsset.AssetFiles)
        {
            // Use the following event handler to check download progress.
            outputFile.DownloadProgressChanged += DownloadProgress;

            string localDownloadPath = Path.Combine(outputFolder, outputFile.Name);

            Console.WriteLine("File download path:  " + localDownloadPath);

            downloadTasks.Add(outputFile.DownloadAsync(Path.GetFullPath(localDownloadPath), blobTransfer, locator, CancellationToken.None));

            outputFile.DownloadProgressChanged -= DownloadProgress;
        }

        Task.WaitAll(downloadTasks.ToArray());

        return outputAsset;
    }

    static void DownloadProgress(object sender, DownloadProgressChangedEventArgs e)
    {
        Console.WriteLine(string.Format("{0} % download progress. ", e.Progress));
    }