m=Import["C:\\Users\\mitra\\Desktop\\MATH528\\lab09\\GuitarString.mp4"]

Length[m]

?Import

d=AudioData[m];

Length[d]

Dimensions[d]

ListPlot[{d[[1,1;;4096]],d[[2,1;;4096]]},PlotStyle->{Red,Blue} ]

data=d[[1,5000+270;;5000+2870]];
ListPlot[data]