PyQt6中關於QMediaPlayer()的一些問題

Question

我正在嘗試使用QMediaPlayer()播放聲音

代碼 1 ：這項工作正常。

import sys

from PyQt6.QtCore import QUrl
from PyQt6.QtMultimedia import QAudioOutput, QMediaPlayer
from PyQt6.QtWidgets import QApplication

app = QApplication([])

filename = "src/2.mp3"
player = QMediaPlayer()
audio_output = QAudioOutput()
player.setAudioOutput(audio_output)
player.setSource(QUrl.fromLocalFile(filename))
audio_output.setVolume(50)
player.play()

sys.exit(app.exec())

代碼 2但這沒有聲音。

import sys

from PyQt6.QtCore import QUrl
from PyQt6.QtMultimedia import QAudioOutput, QMediaPlayer
from PyQt6.QtWidgets import QApplication

app = QApplication([])

def play_it():
    filename = "src/2.mp3"
    player = QMediaPlayer()
    audio_output = QAudioOutput()
    player.setAudioOutput(audio_output)
    player.setSource(QUrl.fromLocalFile(filename))
    audio_output.setVolume(50)
    player.play()

play_it()
sys.exit(app.exec())

我在這里找不到有什么不同。 衷心感謝您的幫助！

Answer 1

在player.play()方法后，它退出 function 並且媒體播放器被垃圾收集。 如果您希望它在 function 調用的 scope 之外存在，則需要通過返回來保留對player的引用。

例如：

import sys

from PyQt6.QtCore import QUrl
from PyQt6.QtMultimedia import QAudioOutput, QMediaPlayer
from PyQt6.QtWidgets import QApplication

app = QApplication([])

def play_it():
    filename = "src/2.mp3"
    player = QMediaPlayer()
    audio_output = QAudioOutput()
    player.setAudioOutput(audio_output)
    player.setSource(QUrl.fromLocalFile(filename))
    audio_output.setVolume(50)
    return player

player = play_it()
player.play()
sys.exit(app.exec())