how to implements a proper WaveformZoom？ about just_waveform

[ryanheise]

If you imagine the lowest number of oscillations per second that a human can actually hear (20 Hz), you would need more than 20 pixels per second to actually see the "wave", so 2-3 pixels per second is a bit outside the expected range of normal usage. I suppose you don't care about the wave, you only care about the amplitude? In which case are you just trying to visualize the volume of the audio?

What is the lowest pixels per second that works?

[liujian-930212]

@ryanheise Thanks for the quick respond.

I was trying to figure out the lowest pixels per second because I noticed that a low pps may cause a null waveform, so I am not sure the pps I'm using is always big enough for a certain audio file.