Odnoklassniki
The official OK help article describes external software streaming with a server address and stream key.
Parameters
The accessible article does not contain a table of bitrates, resolutions, FPS, keyframes or audio settings.
Check the broadcast's encoder guidance or ask OK support. Do not automatically reuse VKontakte recommendations: this is a separate destination.
Enter credentials for the selected OK event in StreamVi, and use StreamVi ingest in OBS or other software. After sending video, check the preview, audio and publication state on OK.