Rain Storm at 42 Mpbs AVCHD

Simple. Divide clip size [in MB] by clip length [in s] and multiply the result by 8 (namely, there are 8 bits in 1 byte). You get average bitrate in Mb/s.

So:
8*size[MB]/length
 
My only problem is finding a program that reliably gives me the Mbps.

Both Quicktime Movie Inspector and MediaInfo says these clips are on average 107 Mbps but that can't be right since I set the limit to 42 Mbps.

What are you guys using to reliably measure the Mbps?

107Mbps sounds like the transcoded ProRes files? But opening the cam's original .mts files in MediaInfoMac should tell you what rate the cam is recording at.
 
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