Script for onset detection

Script for onset detection

"Can anybody provide me with a script that detects the onset of sound (i.e. the end of silence)."

You can create an Intensity contour and look for the first frame that is above some predefined threshold:


To Intensity... 100 0


n = Get number of frames


for i to n

   
intensity = Get value in frame... i

   
if intensity > 40

      
time = Get time from frame... i

      
echo Onset of sound at: 'time:3' seconds.

      
exit

   
endif


endfor

Since the intensity is computed with rather long windows, the result may be 0.01 or 0.02 seconds before the actual start of sound.