Simulcasting broadcasts a live stream simultaneously to multiple platforms — expanding audience reach without duplicating your streaming setup. This guide covers implementing this from a self-hosted VPS.
Why Simulcast from Self-Hosted Infrastructure
See How to Stream Live Video with OBS Studio to a Self-Hosted RTMP Server for the base setup — simulcasting from your own RTMP server (rather than each platform's native multi-streaming feature, if available) gives you full control and avoids per-platform limitations or costs some services impose on simultaneous multi-platform streaming.
The Core Restreaming Architecture
OBS Studio -> Your RTMP Server -> [Restream to Platform A, Platform B, Platform C]Your self-hosted RTMP server receives the single incoming stream and republishes it to multiple destination platforms simultaneously, rather than OBS itself needing to encode/send multiple separate outbound streams.
Configuring Nginx RTMP for Multi-Destination Push
application live {
live on;
push rtmp://platform-a.example.com/live/YOUR_STREAM_KEY;
push rtmp://platform-b.example.com/live/YOUR_STREAM_KEY;
push rtmp://platform-c.example.com/live/YOUR_STREAM_KEY;
}See How to Set Up Nginx RTMP for Live Video Streaming for base RTMP module setup — the push directive republishes your incoming stream to each specified destination automatically.
Understanding Bandwidth Requirements
Simulcasting to multiple platforms multiplies your outbound bandwidth requirement — if pushing to 3 platforms at 5 Mbps each, you need roughly 15 Mbps sustained outbound bandwidth from your VPS, not counting the incoming stream from OBS; verify your VPS plan's bandwidth genuinely accommodates this.
Using Different Quality Settings Per Platform
push rtmp://platform-a.example.com/live/KEY1;
exec ffmpeg -i rtmp://localhost/live/$name -b:v 3000k -f flv rtmp://platform-b.example.com/live/KEY2;Some platforms have different recommended/maximum bitrates — using FFmpeg for platform-specific transcoding before pushing lets you tailor quality per destination rather than sending identical quality to every platform regardless of its specific requirements.
Monitoring Multi-Destination Push Health
See How to Monitor a Kubernetes Cluster with Prometheus and Grafana-style monitoring principles, applied here — monitor that each destination push connection remains healthy; a failure to one destination shouldn't necessarily interrupt the others, but you need visibility into per-destination status.
Handling Reconnection for Failed Pushes
Configure appropriate retry/reconnection behavior for push destinations that experience temporary connectivity issues — verify your specific RTMP module's reconnection behavior meets your genuine reliability needs for a live simulcast.
Considering a Dedicated Restreaming Service (Alternative)
Several third-party services exist specifically for multi-platform restreaming if you'd rather not manage this infrastructure yourself — weigh the convenience/reliability trade-off against the cost and control benefits of self-hosting this specific capability.
Testing Before a Genuine Live Event
Thoroughly test your simulcast configuration (all destinations, actual bandwidth usage under load) well before any important live event — discovering a configuration issue during an actual broadcast is far more costly than catching it during testing.
Common Errors
Stream works to some platforms but not others — verify stream keys and RTMP URLs are exactly correct for each specific destination platform (these are platform-specific and change if regenerated), and check whether the failing platform has specific format/bitrate requirements not being met by your current configuration.
Continue Reading
- How to Set Up Nginx RTMP for Live Video Streaming
- How to Stream Live Video with OBS Studio to a Self-Hosted RTMP Server
- VPS Requirements for Media Streaming Servers
Browse more articles in Media & Streaming Servers.
