How to calculate bandwidth through Multi-bitrate player

Hello everyone
I want to create multi-bitrate player to play VOD and Live stream.
Now for switch between each video bitrate I have to find currently bandwidth between AMS server and client player.
For get current bytes per second I use netstream info but this not stable to decision for switch between bitrates, also I use netConnection checkBandwidth for get the current bandwidth between client-server and sum this value with current bytes persecond for calculate current bandwidth between them but this values is not stable to decision.
Please advise me to fix this problem.
Thanks in advance.

if the bandwidth is not stable between client and server then "it is not stable" not matter what tool you use to measure...What is your specific question?
The server supplied checkbandwdth method is better way to find out bandwidth and is being used by other customers too to make a switch in case of MBR(Multi Bit Rate).

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