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System requirements for HLS with DVR streaming (memory, and hdd)


First question: You published the formula on this page for calculating amount of memory for single stream for HLS.
Did you mean every stream for every connected viewer? Or stream from coder to server?

I noticed that streaming with DVR takes more memory.
How to calculate server system requirements for HLS with DVR?

My life example for future broadcast.

How much memory and HDD space I need for 1 day of such broadcasting:

14 incoming streams (480p) – 1 Mbits
14 incoming streams (720p) – 2,5 Mbits
with DVR for 10 hours (every day)
Maximum connections (viewers) – 200
Outgoing protocol – HLS

How much memory is better for these conditions? What about HDD?