Create an Amazon Chime SDK media concatenation pipeline to archive a meeting recording to S3

Steps

1. Ensure your app uses the ChimeSdkMediaPipelines namespace (not the legacy Chime namespace, which only supports capture pipelines) — migrate if needed
2. Start a media capture pipeline for the meeting first; concatenation pipelines consume that capture pipeline's output, not the live meeting audio directly
3. Call CreateMediaConcatenationPipeline (POST /sdk-media-concatenation-pipelines) with Sources as a single-item array of MediaCapturePipelineSourceConfiguration referencing the capture pipeline's MediaPipelineArn
4. Set Sinks to a single-item array with an S3BucketSinkConfiguration.Destination pointing at your target bucket/prefix
5. Pass a unique ClientRequestToken (2-64 chars) for idempotency
6. Grant the mediapipelines.chime.amazonaws.com service principal s3:PutObject/PutObjectAcl/GetObject at the object level and s3:ListBucket at the bucket level, and confirm the AWSServiceRoleForAmazonChimeSDKMediaPipelines service-linked role exists