AWS products: S3, SQS, SNS, MediaConvert

• Amazon S3 (Simple Storage Service): A scalable and durable object storage service for storing and retrieving any amount of data from anywhere on the web. It is commonly used as the primary storage for input and output files for other AWS services like MediaConvert.
• Amazon SQS (Simple Queue Service): A fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. It uses a polling model where consumers retrieve messages from the queue.
• Amazon SNS (Simple Notification Service): A fully managed pub/sub messaging service that provides high-throughput, push-based delivery of messages to multiple subscribers (including SQS queues, Lambda functions, HTTP endpoints, and email addresses) simultaneously.
• AWS Elemental MediaConvert: A file-based video transcoding service that allows you to convert video files into formats optimized for broadcast and multi-screen delivery (e.g., adaptive bitrate streaming for web/mobile) without managing any underlying infrastructure. 

1. A user uploads a raw video file to an Amazon S3 input bucket.
2. An S3 event notification triggers an Amazon SNS topic or directly invokes an AWS Lambda function when a new object is created.
3. The SNS topic (or Lambda function) initiates a transcoding job in AWS Elemental MediaConvert, providing the S3 input and output locations.
4. MediaConvert processes the file, and its job status changes (e.g., "job complete") trigger Amazon CloudWatch events.
5. These CloudWatch events can be routed to an Amazon SQS queue, where a downstream application can asynchronously poll for job completion status and perform post-processing tasks, such as updating a database or generating a thumbnail from the transcoded output.