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I am working on a system to collect data for noise ordinances and need to correlate video with decibel meters (decibel meter, video and sound) are at the same locations.

A vehicle that emits sound levels greater that ambient plus 3 sigma for a given street is considered to be in violation.

Is there software available that can search by audio levels (i.e., jump to the loudest sections of an MP4 for license plates...)

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If my memory is good, Sony - Sound Forge have an Auto Region tool. This could do the trick.

  • I think Cubase has a similar function, but neither are very good with the video side of this. (The OP needs to view the frame/s in the MP4 where the peaks occur.) Many audio editors have peak analysis, like Audition. They give the time and level of the highest peak. – Marc W Jun 27 '16 at 15:28

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