EasyStream

OneDrive is a good place to keep video — large files, multiple devices, automatic backup. Its built-in player, however, chokes on most of the formats people actually shoot or download: HEVC, MKV, AC-3, anything modern. EasyStream sits between OneDrive and the browser and quietly converts those files on the fly, so anything you've stored is something you can watch.

Sign in with your Microsoft account, browse the same OneDrive folders you already know, click a video. The transcoder gets to work and playback begins as soon as the first chunk is ready — usually within a couple of seconds. Skip around, resume tomorrow on a different device, queue up the next episode. It feels native because every part of the experience runs in your browser.

Built for personal media libraries, course recordings, archives — anywhere the easiest place to store a video is OneDrive and the most natural place to watch it is the device you happen to be holding.

Stateless backend. The transcoder never sees a OneDrive credential. The SPA holds the Microsoft sign-in, asks the Graph API for a pre-authenticated download URL, and hands that URL to the server. The host can run anywhere and forget everything; there is no database, no auth store, no persistent state to compromise.

Streaming into ffmpeg's stdin. Rather than downloading whole files before encoding, the API issues parallel HTTP Range requests against the pre-authenticated URL, reassembles chunks in order through an in-memory buffer, and pipes that buffer into ffmpeg's standard input. A back-pressure cap keeps the buffer bounded so a long film cannot starve the host or spike memory.

Session deduplication. Two devices opening the same OneDrive itemId share one transcode. The session catalogue is keyed by itemId; health checks prevent a poisoned session from taking other devices down with it. A reaper cleans abandoned sessions on a timer so memory always returns to the floor.

HLS event playlist + long-poll. Instead of clients polling the manifest on a tight interval, the server emits an HLS event playlist and exposes a long-poll endpoint for ready-state notifications. Clients fetch new segments only when the playlist grows. When the current session reaches Ready, the next file's transcode kicks off in the background — episodic watching never waits.