Old 9th August 2018, 05:11   #1
Hydros
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Estimating bandwidth

I'm trying to estimate what the total bandwidth for a broadcast might be.

I want to set up my own shoutcast server for a 24-hour event. I've done the broadcasting part before but the server I used then (2016) was a resource donated by a company that has chosen a new direction.

Since it's a public address system feed (voice), high quality is not needed. In the past I was using MP3 encoding of 16kbps, 22050Hz, Mono.

So I take 16000 and multiply by seconds in a day and get 1,382,400,000. That's bits though, right? Do I divide by 8 for bytes? (I'm unsure if MP3 utilizes all 8 bits for data, getting out of my familiarity zone here already.) That would make 172,800,000 bytes/day.

If I specify 16kbps encoding, does the encoder always put out that much or is it adaptive? We'll have fair amounts of dead time on the mics.

Last up, do I multiply by estimated number of listeners? Or perhaps the server sends via multicast ... does that mean bandwidth is the same for 1 or 100 listeners?
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Old 9th August 2018, 07:03   #2
NJK
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https://www.calculator.net/bandwidth-calculator.html

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Old 10th August 2018, 06:04   #3
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That doesn't seem to address my questions very well. Any other pointers?
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Old 10th August 2018, 06:47   #4
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does that mean bandwidth is the same for 1 or 100 listeners? is your question

that is why you calculate what you need in bandwith to determine how many listeners you can handle

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Old 11th August 2018, 03:10   #5
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Quote:
Originally Posted by NJK View Post
does that mean bandwidth is the same for 1 or 100 listeners? is your question
So the answer to that is "no", that the single listener bandwidth is multiplied by listener count?

How about the encoder being adaptive to the input signal?
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Old 11th August 2018, 06:30   #6
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encoder settings is what you set , it can't adapt to the number of listeners.
i get your drift, if more and more listeners start to listen you would love to see that the encoder drops to a lower bitrate but that isn't possible

basicly = upload /bitrate = max listeners.

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Old 14th August 2018, 05:11   #7
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Quote:
Originally Posted by NJK View Post
encoder settings is what you set , it can't adapt to the number of listeners.
i get your drift, if more and more listeners start to listen you would love to see that the encoder drops to a lower bitrate but that isn't possible
No, listener count wasn't what I asked about the encoder. I am still curious if the encoder is adaptive to it's INPUT. For example, I know that MP3 can compress silent mic audio very well, but don't know if it still pumps out all the chosen specified bit-rate during silence. If it adapts to the input, that might save me a bunch of bandwidth to send to listeners.
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Old 14th August 2018, 12:11   #8
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No the encoder is not adaptive
as soon as you start , the bitrate starts to run

perhaps it's easier to setup an ondemand streaming service.
only when a listener clicks on a song , it starts to play.

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