What are the benefits of HLS and DASH over just uploading a whole file?

Question

linux

What advantages will the video service get (NOT online broadcasts, but video on demand)
when switching to one of the listed technologies (HLS and DASH)?
Does it make sense? I see pluses only in the adaptability of the bitrate,
are there any other weighty arguments? Content will be served faster? Perhaps less stress on the screws?
PS I don't fully understand whether it will be necessary to cut all the existing videos into small pieces in advance or is it done on the fly and there is no particular hassle with the transition to these technologies?
Thank you.

Answer 1

That HLS, that DASH, in fact, also give ordinary files, only a lot and short pieces of video. Bitrate adjustment is precisely achieved due to the fact that at low speed the player requests a piece of a smaller file from the user.
The server itself cuts into pieces (nginx, red5 etc) and puts them into a special folder, which the user accesses.
If there is no need for on-the-fly adaptability (during an already running view) or broadcasting events online, you will not get anything but an additional load on the HDD and cpu.

Answer 2

Working with ADB - yes, this is one of the main significant advantages for VOD HLS and VOD DASH.
Prepackaging is a good option, but it has a number of disadvantages. So media servers do it on the fly and cache it.