The video is replaced by digital format and stored on a video server before being delivered to your home. When you make a
VOD platform provider request, the movie is first compressed and sent over a cable or broadband connection. When the movie streaming reaches the server , it is decoded and decompressed by a set-up box before being stored in a video server on the viewer's computer or television.
Here you can find detailed information about each platform provider. For your reference, I have added the list of the
best video on demand platforms , take a look you can get about clarity on providers.