Here are the streaming requirements for Facebook live:
YourHost.com CDN can send both your live website stream and Facebook Live in one stream.
The maximum resolution is 720p (720 x 1280), at 30 frames per second.
You must send a keyframe (I-frame) at least once every two seconds throughout the stream.
The recommended maximum video bitrate is 4 Mbps.
The audio bitrate must be 128 Kbps mono.
The audio sample rate must be 44.1 KHz.
The maximum length is 4 hours.
They are not particularly restrictive but they do provide some limits to what you can stream.