如何在python-vlc中播放音乐时改变音量？

Question

告诉我如何在播放过程中改变音量而不中断播放？也许我需要使用一个额外的库？我的代码示例：

import vlc
import time

url = 'http://prem1.rockradio.com:80/bluesrock?749334267be3790147565672'

#define VLC instance
instance = vlc.Instance('--input-repeat=-1', '--fullscreen')

#Define VLC player
player=instance.media_player_new()

#Define VLC media
media=instance.media_new(url)

#Set player media
player.set_media(media)

#Play the media
player.play()
player.audio_set_volume(50)

Answer 1

我想我有一个答案给你！请注意，这段代码是我正在进行的一个更大项目的一部分。这段代码的某些部分不会按原样格式化。

import threading
import time
import vlc
from tkinter import *

root = Tk()
root.title("Playlist Player")
root.geometry("700x200")

volume = Scale(root, from_=0, to=100, orient=HORIZONTAL)
volume.set(100)
volume.place(x=150, y=20)
root.mainloop()

player = vlc.MediaPlayer()
media = vlc.Media(dir + playlist + "/" + song)
player.set_media(media)
player.audio_set_volume(100)
player.video_set_scale(0.6)
player.play()
play()

clip = MP3(dir + playlist + "/" + song)
clip_info = clip.info
time.sleep(int(clip_info.length))  # Wait until after the clip has finished

player.stop()

def play():
    volumethread = threading.Thread(target=refreshvolume, daemon=True)
    volumethread.start()

def refreshvolume():
    while True:
        changevolume(volume.get())
        time.sleep(0.1)

def changevolume(volume):
    player.audio_set_volume(volume)
    time.sleep(0.1)

所以我在这里所做的就是让一个线程无限循环一个命令，每隔0.1秒改变一次音量(我在其中放入了睡眠，试图降低cpu的使用率)。因此，每隔十分之一秒，就会运行一条命令，将音量更改为任意大小。