Cloudflare launches Streamline developer playground for custom video pipelines

Introducing Streamline for Custom Video Processing

Cloudflare has launched Streamline, a new developer playground designed to showcase the creation of custom video pipelines. This platform allows users to build systems for bespoke video experiences, such as adding dynamic annotations to livestreams or embedding subtitles into hosted videos.

Streamline demonstrates how Cloudflare's Developer Platform, specifically leveraging Workers, Containers, and various media protocols, can be used to modify video content and immediately publish the results as a livestream or a new hosted video.

Addressing the Need for Durable Video Processing

Custom video processing pipelines require a durable, long-running environment capable of executing specialized, compiled code with predictable memory and CPU resources. Video streams can extend for minutes or hours, necessitating a media process lifecycle independent of the initial request.

An application needs to initiate a pipeline, provide input, monitor its progress, and terminate it without maintaining a continuous open request throughout the entire duration of the process.

Cloudflare's Architectural Components

Cloudflare provides the foundational primitives for Streamline's architecture. Containers offer long-lived runtimes suitable for intensive media processing tasks. Durable Objects assist with orchestration, ensuring stateful operations across distributed systems. Workers serve as the control plane, handling signaling and monitoring functions.

In Streamline, a media engine operates within a Container to manage real-time media processing. This Container is managed by a Worker, which exposes control, preview, and testing interfaces to users or agents. Processing continues even if the Worker connection is interrupted.

Streamline's Modular Design

A Streamline deployment comprises two main components: the Media Engine and the controlling Application. The Media Engine is responsible for media input/output and processing, while the Application creates, configures, observes, and stops media sessions.

The Media Engine itself consists of a Controller, written in Go, which translates incoming HTTP requests into media operations, and a Processor that performs the actual media manipulation. The current Processor uses FFmpeg, though this is an internal detail. The modular architecture allows for future integration with dedicated encoding products.