QLabel and setPixmap causes flickering

[roxton]

I'm render just a visible part of the waveform to avoid the full sound peaks calculation. So I think that the rendering of the whole waveform is more time consuming and memory consuming too.
If I use the QPixmap directly, I get the image with some garbage/noise (partially overlapped the waveform).

Update: all fixed! I use QImage::Format_RGB32 now and all works fine

[wysota]

I'm render just a visible part of the waveform to avoid the full sound peaks calculation. So I think that the rendering of the whole waveform is more time consuming and memory consuming too.

It depends whether it is a common task to scroll the wave back and forth. You either calculate the same things once or multiple times.