normalize and amplify

[Wilbert]

Could someone explain me the exact difference between normalizing and amplifying the audio?

Normalize doesn't seem to do anything:

clip=AviSource("D:\captures\birgit.avi")
clip2=converttoyuy2(clip)
clip3=audiograph(clip2,20)

clip4=normalize(clip2,0.5)
clip5=audiograph(clip4,20)
stackhorizontal(clip3,clip5)

results in the same graph.

[sh0dan]

If your audio is already normalized (has it's peak at the maximum volume), nothing will be changed. Use Normalize(show=true) to show the how much amplification is being applied (calculated after the first audio request).

Try:

clip=AviSource("D:\captures\birgit.avi").amplifydb(-6)

to see the difference.