Pygame - Sound delay

Question

I\'ve made a button class that checks if a button is selected (when the mouse is hovering over the button). When the button is selected, unselected or clicked it plays a wav

Answer 1

Decreasing the size of the buffer will reduce the latency. The buffer must be a power of 2. The default buffer is 4096, but you can change it when you initialize mixer as shown below:

pygame.mixer.init(44100, -16, 2, 64)

More information can be found on the pygame docs

Answer 2

I also had problems with sound lagging. I found that calling pygame.mixer.pre_init() before pygame.init() solved my problems:

pygame.mixer.pre_init(44100, -16, 1, 512)
pygame.init()

Answer 3

I had a sound delay, too. Now, this works fine for me:

pg.mixer.pre_init(44100, -16, 1, 512)
pg.init()
pg.mixer.init()

With pg.mixer.pre_init(22100, -16, 2, 64) the sound plays faster but is twisted, okay for sound effects but not for real music as background.

Answer 4

Simply decreasing the size of the buffer, as often suggested for this problem, did not work for me. I found this solution. When initiating the mixer twice, the delay completely disappeared:

import pygame

pygame.mixer.pre_init(22050, -16, 2, 1024)
pygame.init()
pygame.mixer.quit()
pygame.mixer.init(22050, -16, 2, 1024)

It's a bit dirty and I don't know why it works, but hopefully it solves the problem for some people.

Tested on Ubuntu 16.04 LTS with Python 3.6 and pygame 1.9.4

Answer 5

In my situation the delay was between 0.2 and 0.5 sec. To call pygame.mixer.pre_init() is a very good solution but the delay also depends on the given values.

Answer 6

Found an answer posted in another question, which suggest changing the buffer size.