CloudFormation return values for MediaLive Inputs

Question

I have a CFn template that deploys a MediaLive pipeline that gets used by internal people that don't know a lot about the AWS Elemental Media Services. I would like to have the people that deploy this template refer to the Outputs of the CloudFormation template to determine the MediaLive Input destination that they need to push RTMP content to. Documentation (https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-medialive-input.html#aws-resource-medialive-input-return-values) says that the "Destinations" return value should do what I need.

Consider the following CFn:

Outputs:
       MediaLiveInputDestination:
         Value: !GetAtt .Destinations

The template errors when being deployed, stating "Template format error: Every Value member must be a string.". I presume that an array is being passed back to CFn, which means that I have to specify a sub-value under Destinations - but there is no documentation that I can find to determine what sub-values are returned (I've tried the obvious candidates of ".A" and ".0" to no avail).

Any suggestions?

ElementalJohn · Accepted Answer

I just tested this and it works. Can you try it out?

AWSTemplateFormatVersion: 2010-09-09
    Parameters:
      Stream1:
        Description: StreamName1
        Type: String
        Default: test/test1
      Stream2:
        Description: StreamName2
        Type: String
        Default: test/test2
    Metadata:
      'AWS::CloudFormation::Designer':
        0c5c0850-c9e8-4019-97b0-d950aaf22611:
          size:
            width: 60
            height: 60
          position:
            x: 151
            'y': 145
          z: 0
    Resources:
      MLI5AM0O:
        Type: 'AWS::MediaLive::Input'
        Properties:
          Type: RTMP_PUSH
          Name: Testing12345
          InputSecurityGroups:
            - 2461108
          Destinations:
            - StreamName: !Ref Stream1
            - StreamName: !Ref Stream2
        Metadata:
          'AWS::CloudFormation::Designer':
            id: 0c5c0850-c9e8-4019-97b0-d950aaf22611
    Outputs:
      StreamingPrimaryURL:
        Description: Primary Ingest
        Value: !Select [ 0, !GetAtt MLI5AM0O.Destinations]
        
      StreamingSecondaryURL:
        Description: Secondary Ingest
        Value: !Select [ 1, !GetAtt MLI5AM0O.Destinations]

| Key | Value | Description | Export name |
| --- | --- | --- | --- |
| StreamingPrimaryURL | rtmp://52.201.128.200:1935/test/test1 | Primary Ingest	| - |
| StreamingSecondaryURL | rtmp://54.173.229.233:1935/test/test2 | Secondary Ingest | - |

Key	Value	Description	Export name
StreamingPrimaryURL	rtmp://52.201.128.200:1935/test/test1	Primary Ingest	-
StreamingSecondaryURL	rtmp://54.173.229.233:1935/test/test2	Secondary Ingest	-

CloudFormation return values for MediaLive Inputs

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