StreamYard

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Do not build this. Restreaming to every platform at once is the product, and it is bandwidth plus a working relationship with each destination.

One stream in, several out, each re-encoded to that platform's requirements, is a machine doing real work continuously for the length of a broadcast — and each destination needs credentials, key handling and its own quirks.

WHEN TO KEEP PAYING
- You stream live to more than one platform, with guests who join from a browser
- Anything where a dropped broadcast is a public failure

WHEN TO BUILD
- Streaming to one platform. OBS Studio is free, better, and does everything the browser version does with more control

THE FREE ANSWER FOR ONE DESTINATION
- OBS Studio, which handles scenes, overlays, transitions, capture and streaming, and is what most professionals use
- Guests over any meeting service, captured as a window source
- That covers the majority of what people pay for here, for nothing

IF YOU MUST RESTREAM
- nginx with the RTMP module, or a small relay, taking your ingest and pushing to each destination
- **Bandwidth is the cost**, and it is multiplied by the number of destinations. Three outputs at a reasonable bitrate is a sustained load for the whole broadcast — size the machine and the connection for it, and test at full load before it matters
- Each platform has its own requirements: bitrate ceilings, key frame intervals, resolutions and reconnection behaviour. Re-encode per destination rather than hoping one stream satisfies all of them
- A destination that drops must not take the others with it. Isolate each output and reconnect independently
- Stream keys encrypted at rest and never logged

THE PART THAT DECIDES WHETHER IT WORKS
Rehearse the whole thing at full load, to all destinations, for longer than your broadcast will run. A relay that works for five minutes and fails at forty is the specific failure here, and it is only found by running it.

AND THE CHEAPEST IMPROVEMENT
Audio matters more than video for a live broadcast. A decent microphone and loudness normalisation improve the result more than any restreaming.

THE ONE-LINE VERSION
Use OBS for one platform. Restreaming is bandwidth — price it, and rehearse at full load before you rely on it.