Is there any way to get volume level of  netStream?

Hello,
I want to get the activity level of audio of a NetStream, similar to how you can do it with a Microphone.
In this article,
http://stackoverflow.com/questions/1442913/as3-audio-activity-level-of-a-netstream
NetStreamInfo.audioBytesPerSecond is said to be the solution.
However, audioBytesPerSecond indicates how many data volume the stream have.
It does not get volume level of the stream.
It is not the same as microphone.activityLevel.
Is there any way to get volume level of netStream?
Thanks in advance.

Thank you very much for your answer.
I will use audioBytesPerSecond.
I've tried SoundMixer class also, but it seems not working on streaming movies.

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