The max files size remains 20 mb. If you are merely storing the meta-data and identifying information in Couchbase and the actual media data in a media-streaming cloud service, the max file size is not an issue.
There are a number of considerations one weighs when modeling data stored in a distributed architecture like Couchbase. A recommended minimum node count in a cluster is 3. This is to establish a quorum to resolve conflicts in the case of simultaneous updates. The 3rd node serves as a tie-breaker when deciding which request is considered “last in” and stored.
At any rate, each document is stored and replicated across the network, node-to-node and memory first. Unnecessarily large data-objects could really hurt your responsiveness and performance.
My recommendation is NOT to store large objects of any kind in Couchbase or any database technology, regardless of whether they will fit or not.
I hope you find this helpful.