| services | platforms | author |
|---|---|---|
media-services,functions |
dotnet |
johndeu |
This project contains examples of using Azure Functions with Azure Media Services. The project includes several folders of sample Azure Functions for use with Azure Media Services that show workflows related to ingesting content directly from blob storage, encoding, and writing content back to blob storage. It also includes examples of how to monitor job notifications via WebHooks and Azure Queues.
It is recommended that you first fork the project and update the "sourceCodeRepositoryURL" in the azuredeploy.json template parameters when deploying to your own Azure account. That way you can more easily update, experiment and edit the code and see changes reflected quickly in your own Functions deployment.
If you have questions about Azure Media Services and Functions, we encourage you to reach out and participate in our community. The Media Services engineering and product management team monitors the following community sites and is available to help.
- For all questions and technical help, our MSDN forums are an easy place to have a conversation with our product team.
- For questions which fit the Stack Overflow format ("how does this work?"), we monitor the azure-media-services tag.
- You can also tweet/follow @MSFTAzureMedia.
While we do our best to help out in a timely basis, we don't have any promise around the above resources. If you need an SLA on support from us, it's recommended you invest in an Azure Support plan.
Ideas and contributions are always welcome. We are trying to build a community around creating unique Media workflows that combine the power of Azure Media Services with Azure Functions and Logic Apps.
If you have questions or ideas, please reach out to us on our MSDN forum, Twitter at @MSFTAzureMedia, or on StackOverflow using the tag azure-media-services
To edit the code, you have a few options:
-
Visual Studio Code (VS Code)
VS Code may have some issues with validating run.csx files, as it attempts to resolve some dependencies. You might want to use VS Code in combination with the Azure Functions CLI. For more information, see this blog.
-
Visual Studio 2015.
To use VS 2015, you need to install the following:
- Visual Studio 2015 Update 3 with Microsoft Web Developer Tools.
- Azure 2.9.6 .NET SDK
- Visual Studio Tools for Azure Functions
For more detailed information, see this blog.
To run the samples, first fork this project into your own repository, and then deploy the Functions with the azuredeploy.json template Make sure to update the path to point to your github fork.
The deploymnet template will automatically create the following resources:
- Azure Media Services Account.
- Storage account attached to your media account.
- This Azure Functions application with your source code configured for continuous integration.
- The required function's application settings will be updated to point to the new resources automatically. You can modify any of these settings after deployment.
The following applications settings are created upon deployment and are automatically linked to the resources deployed with the azuredeploy.json template.
-
AMSAccount - your Media Services Account name.
-
AMSKey - your Media Services key.
-
MediaServicesStorageAccountName - the storage account name tied to your Media Services account.
-
MediaServicesStorageAccountKey - the storage account key tied to your Media Services account.
-
StorageConnection - the functions.json file contains a "StorageConnection" property which must be set to an App Setting value that contains a connection string for your input storage account. Otherwise, you may end up with an error message at startup. Make sure to add a new AppSetting to your Functions project with the storage account name and connection string, and update the functions.json file if you see this error:
-
SigningKey - the 64-byte Base64 encoded signing key to use to protect and secure your WebHooks callbacks from Azure Media Services. This key is for sample purposes only and you should replace this key with your own.
Example value:
wOlDEUJ4/VN1No8HxVxpsRvej0DZrO5DXvImGLjFhfctPGFiMkUA0Cj8HSfJW7lePX9XsfHAMhw30p0yYqG+1A== -
WebHookEndpoint - the Webhook URL endpoint for the deployed Notification_Webhook_Function in this project to be used by Azure Media Services to callback to your Function from the Encoding job Functions.
If you are adjusting the deployment settings to use an existing Media Services account or storage account, you can find the connection string for your storage account in the Azure portal(Ibiza). Go to Access Keys in Settings. In the Access Keys blade go to Key1, or Key2, click the "..." menu and select "view connection string". Copy the connection string.
The output container name can be modifed in run.csx by changing the value of the static string _outputContainerName. It's set to "output" by default.
The EncodeBlob_SingleOut_Function demonstrates how to use an Output binding and the "InOut" direction binding to allow the Azure functions framework to create the output blob for you automatically.
In the function.json, you will notice that we use a binding direction of "InOut" and also set the name to "outputBlob". The path is also updated to point to a specific output container, and a pattern is provided for naming the output file. Notice that we are binding the input {filename} to the output {filename} pattern match, and also specifying a default extension of "-Output.mp4".
{
"name": "outputBlob",
"type": "blob",
"direction": "InOut",
"path": "output/{fileName}-Output.mp4",
"connection": "StorageConnection"
}
In the run.csx file, we then bind this outputBlob to the Run method signature as a CloudBlockBlob.
public static void Run( CloudBlockBlob inputBlob,
string fileName,
string fileExtension,
CloudBlockBlob outputBlob,
TraceWriter log)
To output data to this outputBlob, we have to copy data into it. The CopyBlob() helper method (in 'Shared/copyBlobHelpers.csx') is used to copy the stream from the source blob to the output blob. Since the copy is done async, we have to call Wait() and halt the function execution until the copy is complete.
CopyBlob(jobOutput,outputBlob).Wait();
Finally, we can set a few properties on the outputBlob before the function returns, and the blob is written to the configured output storage account set in the function.json binding.
// Change some settings on the output blob.
outputBlob.Metadata["Custom1"] = "Some Custom Metadata";
outputBlob.Properties.ContentType = "video/mp4";
outputBlob.SetProperties();
This function demonstrates how to use WebHooks to listen to a basic encoding job's progress.
The function works in combination with the Notification_Webhook_Function, which acts as that "callback" for the Job status
Notifications.
When setting up the Job in this function, you will note that the webhook is passed in as a Notification endpoint along with its signing key for securing the payload. You must set the signingKey and the WebHook endpoint in the App settings as specified above.
This workflow for this function waits for content to be copied into the input container in blob storage. This is configured in the function.json file's bindings.
{
"name": "inputBlob",
"type": "blobTrigger",
"direction": "in",
"path": "input/{fileName}.{fileExtension}",
"connection": "StorageConnection"
}
The name property sets the name of the CloudBlockBlob property that is passed into the Run method. The path property sets the container name and file matching pattern to use. In this example, we set the {fileName} and {fileExtension} matching patterns to pass the two values into the Run function.
public static void Run(CloudBlockBlob inputBlob, TraceWriter log, string fileName, string fileExtension)
You can monitor the callbacks in the Notification_Webhook_Function logs while the job is running. To test the method, drop a new media file into the container specified in the binding's input path.
This function can call a Logic App at the end. Specify the call back Url in LogicAppCallbackUrl in your function's Application Settings.
This function will upload several files into a single asset. A json file must be uploaded to the blob container withh the referenced files.
The format of the json file is:
[
{
"fileName": "BigBuckBunny.mp4",
"isPrimary": true
},
{
"fileName": "Logo.png"
}
]
LA-1-CreateEmptyAsset, LA-2-SyncAssset, LA-3-LiveAnalytics, LA-3-SubmitJob, LA-4-CheckJobStatus, LA-5-Publish functions
These functions are designed to be called by a Logic App. More details and Logic App samples to come.
One specific patterns to pay attention to here include the LA-4-CheckJobStatus function which is used to poll for job status from a Logic App workflow.
This set of functions is designed to be used with a Logic App template that is being developed. You are welcome to use these as Samples for your own logic apps at this time.
This sample project is licensed under the MIT License
- The Azure Queue notification function is not yet complete
- Copy Blobs currently is using Streams, and copies in an inefficient way.
- Document the Logic Apps functions
- We are still working on improving the ARM template and we also plan to modify the directoy structure of this project to make it easier to understand and deploy smaller "scenarios"