Video broadcasting, streaming video. In what software can you create playlists, with their subsequent automatic output?

Question

Software and Internet Services

Good afternoon. Interested in programs for broadcasting, with the possibility of compiling a playlist (for a day, a week, etc.), with the further output of this playlist to the stream. Also interested in the possibility of overlaying subs, watermarks, mixing with other video streams (in real time) on this stream?
Or tell me what you can read about terrestrial Internet TV broadcasting? (in what they make a grid for broadcasting, what they mix with live broadcast inserts).
Thank you.