Create a job input from a local file

In Media Services v3, when you submit Jobs to process your videos, you have to tell Media Services where to find the input video. The input video can be stored as a Media Service Asset, in which case you create an input asset based on a file (stored locally or in Azure Blob storage). This topic shows how to create a job input from a local file. For a full example, see this GitHub sample.

Prerequisites

.NET sample

The following code shows how to create an input asset and use it as the input for the job. The CreateInputAsset function performs the following actions:

  • Creates the Asset
  • Gets a writable SAS URL to the Asset’s container in storage
  • Uploads the file into the container in storage using the SAS URL
private static async Task<Asset> CreateInputAssetAsync(
    IAzureMediaServicesClient client,
    string resourceGroupName,
    string accountName,
    string assetName,
    string fileToUpload)
{
    // In this example, we are assuming that the asset name is unique.
    //
    // If you already have an asset with the desired name, use the Assets.Get method
    // to get the existing asset. In Media Services v3, the Get method on entities returns null 
    // if the entity doesn't exist (a case-insensitive check on the name).

    // Call Media Services API to create an Asset.
    // This method creates a container in storage for the Asset.
    // The files (blobs) associated with the asset will be stored in this container.
    Asset asset = await client.Assets.CreateOrUpdateAsync(resourceGroupName, accountName, assetName, new Asset());

    // Use Media Services API to get back a response that contains
    // SAS URL for the Asset container into which to upload blobs.
    // That is where you would specify read-write permissions 
    // and the exparation time for the SAS URL.
    var response = await client.Assets.ListContainerSasAsync(
        resourceGroupName,
        accountName,
        assetName,
        permissions: AssetContainerPermission.ReadWrite,
        expiryTime: DateTime.UtcNow.AddHours(4).ToUniversalTime());

    var sasUri = new Uri(response.AssetContainerSasUrls.First());

    // Use Storage API to get a reference to the Asset container
    // that was created by calling Asset's CreateOrUpdate method.  
    CloudBlobContainer container = new CloudBlobContainer(sasUri);
    var blob = container.GetBlockBlobReference(Path.GetFileName(fileToUpload));

    // Use Strorage API to upload the file into the container in storage.
    await blob.UploadFromFileAsync(fileToUpload);

    return asset;
}

The following code snippet creates an output asset if it doesn't already exist:

private static async Task<Asset> CreateOutputAssetAsync(IAzureMediaServicesClient client, string resourceGroupName, string accountName, string assetName)
{
    // Check if an Asset already exists
    Asset outputAsset = await client.Assets.GetAsync(resourceGroupName, accountName, assetName);
    Asset asset = new Asset();
    string outputAssetName = assetName;

    if (outputAsset != null)
    {
        // Name collision! In order to get the sample to work, let's just go ahead and create a unique asset name
        // Note that the returned Asset can have a different name than the one specified as an input parameter.
        // You may want to update this part to throw an Exception instead, and handle name collisions differently.
        string uniqueness = $"-{Guid.NewGuid().ToString("N")}";
        outputAssetName += uniqueness;
        
        Console.WriteLine("Warning – found an existing Asset with name = " + assetName);
        Console.WriteLine("Creating an Asset with this name instead: " + outputAssetName);                
    }

    return await client.Assets.CreateOrUpdateAsync(resourceGroupName, accountName, outputAssetName, asset);
}

The following code snippet submits an encoding job:

private static async Task<Job> SubmitJobAsync(IAzureMediaServicesClient client,
    string resourceGroupName,
    string accountName,
    string transformName,
    string jobName,
    string inputAssetName,
    string outputAssetName)
{
    // Use the name of the created input asset to create the job input.
    JobInput jobInput = new JobInputAsset(assetName: inputAssetName);

    JobOutput[] jobOutputs =
    {
        new JobOutputAsset(outputAssetName),
    };

    // In this example, we are assuming that the job name is unique.
    //
    // If you already have a job with the desired name, use the Jobs.Get method
    // to get the existing job. In Media Services v3, the Get method on entities returns null 
    // if the entity doesn't exist (a case-insensitive check on the name).
    Job job = await client.Jobs.CreateAsync(
        resourceGroupName,
        accountName,
        transformName,
        jobName,
        new Job
        {
            Input = jobInput,
            Outputs = jobOutputs,
        });

    return job;
}

Job error codes

See Error codes.

Next steps

Create a job input from an HTTPS URL.