Simulcasting: Stream to YouTube, Twitch, and Facebook Simultaneously
What simulcasting is, how to set it up, the tools that make it possible, and whether streaming to multiple platforms at once is right for your channel.
Simulcasting
Simulcasting (simultaneous broadcasting) is the practice of streaming the same live content to multiple platforms at the same time — for example, broadcasting one stream that appears live on YouTube, Twitch, and Facebook simultaneously. It multiplies your audience reach without requiring you to create separate content for each platform.
3×
Potential audience reach when simulcasting to YouTube + Twitch + Facebook
1
Stream to produce — the same content goes to all platforms at once
Banned
Twitch Partners cannot simulcast to competing platforms (Affiliates can)
RTMP
Each platform receives a separate RTMP connection from your streaming tool
⚡ Platform Rules Warning
Twitch Partners are contractually prohibited from simulcasting to competing live streaming platforms (YouTube, Facebook Live). Twitch Affiliates are allowed to simulcast. YouTube and Facebook have no simulcasting restrictions. Always check the terms of service for any platform you’re streaming to.
How Simulcasting Works Technically
- Your PC encodes once: Your streaming software (OBS or similar) encodes the video stream once from your source.
- Multiple RTMP outputs: The encoded stream is sent simultaneously to multiple RTMP ingest servers — one per platform. Each platform has its own URL and stream key.
- Each platform broadcasts independently: YouTube, Twitch, and Facebook each receive the stream and distribute it to their audiences separately. The streams are independent — one platform going down doesn’t affect others.
- Chats remain separate: Each platform has its own live chat. Multi-platform chat aggregation tools (Restream Chat, Streamlabs) can merge them into one interface.
Simulcasting Tools Compared
| Tool | Method | Platforms | Price |
|---|---|---|---|
| Restream.io | Cloud-based RTMP relay | 30+ platforms | Free (720p) / Paid |
| Streamyard | Browser-based | YouTube, FB, LinkedIn, Twitter | Paid ($49/mo) |
| OBS + Multiple RTMP plugin | Local (uses more bandwidth) | Any RTMP platform | Free |
| Castr | Cloud-based | 40+ platforms | Paid ($12.50/mo) |
| Streamlabs | Desktop app with multistream add-on | YouTube, Twitch, FB | Free / Prime $19/mo |
Pros and Cons of Simulcasting
- Pro: Reach multiple platform audiences simultaneously without extra content creation
- Pro: Grow on newer platforms (YouTube, Facebook) while maintaining your existing Twitch audience
- Pro: Diversify your income — each platform has its own monetization system
- Con: Chat is split across platforms — community feel is diluted
- Con: Twitch Partners cannot simulcast — check your contract
- Con: Requires more upload bandwidth (each platform needs its own RTMP stream)
- Con: Harder to build a primary community on any one platform
Simulcasting vs. Multi-Streaming vs. Cross-Posting
| Method | Description | Best For |
|---|---|---|
| Simulcasting | Same stream broadcast live to multiple platforms simultaneously | Live events; audience growth across platforms |
| Multi-streaming via relay | Cloud service re-broadcasts your single stream to multiple platforms | Lower bandwidth usage; managed service |
| Cross-posting (upload) | Upload the same VOD to multiple platforms after the live stream ends | Evergreen content; no simultaneity needed |
Build Your YouTube Audience with Automated Streams
Instead of splitting attention across platforms, focus your pre-recorded live streams on YouTube for maximum algorithmic benefit — without the complexity of simulcasting setup.
Frequently Asked Questions
Does simulcasting hurt my performance on any one platform?
Potentially on Twitch — Twitch’s algorithm prioritizes exclusive live content, and simulcasting can reduce your discoverability in Twitch search compared to exclusive streamers. YouTube and Facebook do not penalize simulcasted content. For growing YouTube specifically, dedicated YouTube streaming often performs better than splitting between platforms.
How much upload bandwidth does simulcasting require?
Each platform requires a separate RTMP stream at your target bitrate. If you’re streaming at 6,000 kbps and simulcasting to 3 platforms, you need at least 18,000 kbps (18 Mbps) of upload bandwidth. Cloud relay services like Restream solve this — you send one stream to Restream at 6,000 kbps, and they handle redistribution, reducing your bandwidth needs.