How to organize a high-quality video broadcast on youtube, facebook, periscope?

Question

YouTube

We are going to organize a series of lectures on athletics and not only, we will invite Olympians and not only.
We tried test shootings, it turned out very badly, of low quality, I would like to somehow do it so that only those who lead the lecture would be heard, so that there would be high-quality sound, and if suddenly this is even possible with such streaming, then it would be possible to switch the picture on slides from the presentation.
Actually social networks in which you would like to broadcast in descending order of interest Youtube, Facebook, Periscope.
Tell me how to organize work with sound, what equipment will be needed, what would you advise? Is it possible to embed frames from the presentation into the broadcast? Is it possible to change cameras during a presentation? For example, somehow connect two or three external cameras and switch the picture between them? If possible, how?

Answer 1

I have experience only with Youtube.
Software:
Windows 7
OBS Classic
Equipment:
Computer (laptop) i7 is better (i5 is possible)
Camera from Logitech C920 and further for example conference cam models, how much money is there.
Microphone at will and needs.
Options with capture boards and the right cameras are even more expensive.
Internet with outgoing 3 megabits minimum. And it is desirable to measure to the server or to the European node.
Windows 7 - because it works worse on 8 or 10.
OBS - because Adobe Media Encoder does not know how to do picture in picture for example, multiple sources, scenes.
This is the minimum you can start with.

Answer 2

I have been doing video conferencing for a long time, this is my main business.
A prerequisite is a thick communication channel from the shooting point. When holding events on the city embankment, optics were promptly thrown there.
To obtain a high-quality image, first of all, you need high-quality lighting and a qualified operator, with the appropriate camera.
What to stream and where to stream - the fifth thing. I sell software that works great on Ubuntu. But, before advising anything other than the means that YouTube and other video services offer by default, I must ask you a question - what are the goals and what is the budget. The notorious quality will cost a little money, there are no options.