Multicast to CamSite with OBS
Already streaming on another site with OBS? You can send the exact same broadcast to CamSite.me at the same time, with no second computer, no second camera setup, and almost no extra work on your machine. This guide walks you through adding CamSite as a second output so going live here costs you nothing extra.
What is multicasting (and why do it)?
Multicasting (also called “multistreaming”) means sending one OBS broadcast to two or more destinations at once. Your camera, scenes, overlays, and tips run exactly as they do today. OBS just delivers an extra copy of the encoded video to CamSite alongside your existing platform.
The upside: every minute you’re already live elsewhere becomes a minute you’re live on CamSite too, in front of a new audience, with no extra time at the keyboard. Because OBS encodes the video once and reuses it for every output, your CPU/GPU cost is essentially unchanged; only your upload bandwidth roughly doubles for the second destination.
CamSite is OBS-ready: get your ingest credentials
CamSite ingests RTMPS directly, so there’s nothing extra to install on our side. Open the broadcast page and switch the broadcast method to OBS / external encoder. You’ll see two values you’ll paste into OBS:
- Server URL: your CamSite RTMPS ingest endpoint.
- Stream key: your private key. Treat it like a password; you can rotate it from the same panel.
Encoding settings
In OBS, set Settings → Stream → Service to Custom… and paste the ingest URL and stream key from the panel. Then match these encoder settings so CamSite accepts and renders your stream cleanly:
- Video codec: H.264
- Audio codec: AAC
- Keyframe interval: 2-second keyframe interval (2s)
- Resolution & bitrate: ≤1080p at ≤8.5 Mbps
These match the limits shown on the OBS panel itself, so a setup that works on CamSite will also satisfy most other platforms.
Add CamSite as an additional output
OBS sends its primary stream to one destination, so to also reach CamSite you add a second output. Pick whichever of these fits your setup:
1. The multi-RTMP plugin
Install the free obs-multi-rtmp plugin, then add a new target with your CamSite ingest URL and stream key. Keep your existing platform as the main OBS stream and start the CamSite target from the plugin’s dock. This is the most common way to multicast from a single PC.
2. OBS native multi-output
Recent OBS builds support multiple stream outputs natively (no plugin). Add CamSite as a second custom output with your ingest URL and stream key, alongside your existing destination.
3. A multistream relay
Prefer not to touch OBS? Point OBS at a multistream relay (Restream-style service), then add CamSite as one of the relay’s destinations using your ingest URL and stream key. The relay fans your single OBS stream out to every site. This offloads the second upload from your PC but routes your video through a third party.
Caveats & before you start
New / untrusted broadcasters start out unlisted. Your first streams may go live pending review, hidden from the public grid until a moderator approves you. This is normal; it clears once you’re trusted.
Pick the closest region. CamSite has ingest in US East (us-east-1) and EU West (eu-west-1). Choose the region nearest you in the OBS panel’s Region selector for the lowest latency and most stable connection.