Broadcast Box
Broadcast Box provides a self-hostable broadcast application, according to its repository description.
About Broadcast Box
Broadcast Box is a self-hostable application for broadcasting and screen-sharing over WebRTC in sub-second time. It accepts input from OBS via WHIP, from a browser page that captures screen or webcam, and from FFmpeg and GStreamer, using the same stream key for publishing and playback.
A public instance is hosted at b.siobud.com, and it can also be run locally. Playback is by stream-key URL with multi-view and cinema-mode options. FFmpeg WHIP input is limited to H.264 video and Opus audio, and OBS defaults to about 2 seconds of latency unless configured for low latency.
Key features
- Stream from OBS using WHIP with a custom stream key
- Publish screen or webcam directly from browser publish page
- Watch by stream-key URL with multi-stream viewing support
- Open player in chrome-free layout with cinemaMode parameter
- Broadcast with FFmpeg using H.264 video and Opus audio
- Run locally using Docker, Docker Compose or source build
Best for: People who want to self-host low-latency WebRTC broadcasts or screen-shares for friends.
Good for
- Open-source repository that can be run locally
- Supports OBS, browser, FFmpeg and GStreamer publishing methods
- Observed 120 millisecond latency example for OBS to player playback
Watch out for
- OBS defaults to about 2 seconds of latency without x264 zerolatency configuration
- FFmpeg WHIP input only supports H.264 video and Opus audio
- GStreamer use expects gstreamer-1.0 with good, bad, ugly plugins and gst-plugins-rs
Broadcast Box at a glance
- Category
- Design & Creative › Video Editing & Animation
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for Video Editing & Animation
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Broadcast Box FAQ
How do I broadcast with OBS?
Set Service to WHIP, Server to https://b.siobud.com/api/whip, and Stream Key to any key you like, then press Start Streaming. The same key is used for playback.
How do I publish from a browser?
Open /publish/, for example https://b.siobud.com/publish/StreamTest. You can capture screen or webcam, and the same stream key is used for playback.
How do I watch a stream?
Open https://b.siobud.com/, such as https://b.siobud.com/StreamTest, or enter the key on the home page. Use the Add Stream button for multi-view and ?cinemaMode=true for a chrome-free layout.
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