Streamline: custom video pipelines with Cloudflare Stream and Workers

Cloudflare has introduced Streamline, an open-source developer playground and reference architecture for building customizable video-processing pipelines on its Developer Platform. Streamline combines Workers for control and monitoring, Containers for long-running real-time media processing, and Durable Objects for session orchestration and preview relays, allowing applications to modify livestreams or hosted videos with features such as filters, image overlays, animated annotations, burned-in subtitles, re-encoding, and picture-in-picture. It accepts RTMP, HLS, and application-supplied webcam inputs, can send processed output to Cloudflare Stream via RTMP, and supports low-latency preview delivery over WebSockets. Its session-based API lets applications start, resume, monitor, supply media to, and stop pipelines while containers continue operating independently of client connections and are automatically limited by lifecycle controls. The current media engine uses FFmpeg internally, while its modular design could support other encoding technologies later. Security measures include Cloudflare Access authentication, isolated single sessions, protected Stream credentials, and per-session preview authorization. Cloudflare has released the media engine and demo application on GitHub, provided a public playground, and identified future possibilities including computer vision, hardware acceleration, WebRTC and MoQ support, and native media primitives in Workers.

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