How to stream audio/video?

Question

Java

There is a certain local file server.
There is a server and client software (self-written), which allows you to exchange files with the server.
In general, to view a file (any), you must first download it from the server (on a TV, for example, some videos simply do not fit and you have to look for films of poorer quality).
But I would like to somehow not download the entire files (specifically audio / video), but transfer only the part that is necessary for playback.
For example, I open the video through the "player" (on Windows, like a regular video / audio file) and what next? How can I tell the player that the file is streaming and how do I understand what the player needs? ...
In general, in which direction should I dig?

Answer 1

Dig towards video streaming protocols - RTP, RTCP, RTSP, RTMP, HLS, HDS, DASH.