How to select EC2 instance based on the number of camera streams publishing to Amazon Kinesis Video Stream

Hi. This blog and associated repo should be a good starting point.

https://aws.amazon.com/blogs/iot/build-a-cloud-gateway-to-ingest-rtsp-video-to-amazon-kinesis-video-streams/

https://github.com/aws-samples/cloud-gateway-for-amazon-kinesis-video-streams

You'll see that when the EC2 option is used (instead of Fargate), it uses t3.medium. However, the amount of resource you'll need will vary depend on factors like the number of cameras/streams, the resolution, the frame rate, the bit rate, network conditions and so forth. As a broad starting point, please review the KVS system requirements, in regards to the producer SDK: https://docs.aws.amazon.com/kinesisvideostreams/latest/dg/system-requirements.html. Per the blog, you might consider to scale horizontally using auto scaling, rather than size a single instance.