Record an Amazon Chime SDK meeting to S3 using a Media Capture Pipeline and concatenate the MP4 chunks

Steps

1. Call CreateMediaCapturePipeline (chime-sdk-media-pipelines regional endpoint) with SourceType=ChimeSdkMeeting, SourceArn pointing to your meeting, and SinkType=S3Bucket with your bucket ARN and prefix.
2. The pipeline writes 5-second MP4 segment files to S3 for both audio (all-attendee mixed audio and active-speaker video in AudioWithActiveSpeakerVideo mode) and individual video streams — file names carry a timestamp in the format yyyy-MM-dd-HH-mm-ss-SSS.mp4.
3. To end capture, call DeleteMediaCapturePipeline with the pipeline ID; the pipeline status transitions to Deleting and then the final segments are flushed to S3.
4. Create a Media Concatenation Pipeline (CreateMediaConcatenationPipeline) pointing at the same S3 prefix to merge the 5-second MP4 chunks into a single MP4 output file.
5. Monitor the concatenation pipeline status via GetMediaPipeline until it reaches Stopped, then retrieve the concatenated MP4 from the output S3 location.