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dfine.io Studio picks these values itself, see dfine.io Studio. Every other encoder that streams to Streaming Classic needs the same handful of settings. Set them once, then enter your ingest URL and stream key.
The keyframe interval decides how fast a viewer sees the first frame. With a keyframe only every 2 seconds, viewers waited 0.7 to 2.4 seconds longer for the picture in our measurements. A keyframe every second keeps the start short.
The player only plays Main or Constrained Baseline. With the High profile, viewers see “Please set your encoder to the Main or Constrained Baseline H.264 profile, then restart the stream.”

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Settings per encoder

Kiloview E1

The H.264 main stream parameters in the web interface.

Blackmagic WebPresenter and ATEM

A streaming XML with bitrate profiles to load into the setup utility.

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AJA HELO

In the HELO web interface, create a streaming profile with the values from the table above: H.264 with the Main profile, a keyframe every second, CBR at your bitrate and AAC audio at 48 kHz. Set the stream to RTMPS and enter your ingest URL and your stream key in its stream settings.