pygame audio playback speed

Question

quick question.

I\'m running pygame under linux just to play some audio files. I\'ve got some .wav files and I\'m having problems playing them back at the right spe

Answer 1

I had some mp3 audio tracks playing back slowed down. I updated the mixer frequency to be based on the mp3 sample rate using mutagen like so:

import pygame, mutagen.mp3

song_file = "your_music.mp3"

mp3 = mutagen.mp3.MP3(song_file)
pygame.mixer.init(frequency=mp3.info.sample_rate)

pygame.mixer.music.load(song_file)
pygame.mixer.music.play()

And it fixed the problem.

Answer 2

I figured it out... There is a wave module http://docs.python.org/library/wave.html and it can read the sample rate for wav files.

Answer 3

Open your audio file in a free audio tool like Audacity. It will tell you the sampling rate of your media. It will also allow you to convert to a different sampling rate so all your sounds can be the same.

Answer 4

If you're using Ogg Vorbis (.ogg) encoding, the same problem of stuttering audio happens. You'll have to read the frequency of what you're trying to play before initializing the mixer object.

Here's how to play .ogg audio with appropriate frequency using pygame.

from pyogg import VorbisFile
from pygame import mixer

# path to your audio
path = "./file.ogg"
# an object representing the audio, see https://github.com/Zuzu-Typ/PyOgg
sound = VorbisFile(path)
# pull the frequency out of the Vorbis abstraction
frequency = sound.frequency
# initialize the mixer
mixer.init(frequency=frequency)
# add the audio to the mixer's music channel
mixer.music.load(path)
# mixer.music.set_volume(1.0)
# mixer.music.fadeout(15)
# play
mixer.music.play()

Answer 5

To improve Chris H answer. Here is a example of how to use the wave library.

import wave
import pygame

file_path = '/path/to/sound.wav'
file_wav = wave.open(file_path)
frequency = file_wav.getframerate()
pygame.mixer.init(frequency=frequency)
pygame.mixer.music.load(file_path)
pygame.mixer.music.play()

Remember that if you want to change frequency or any other parameter used in pygame.mixer.init you must call pygame.mixer.quit first. Pygame documentation