最近参与了做时,在win下调试遇到一个致命问题:音乐无法播放,但切到Ubuntu下又是正常的,
使用的代码如下:
#!/usr/bin/env python#-*- coding:utf-8 -*-from PyQt4 import QtGui, QtCorefrom PyQt4.phonon import Phononclass Window(QtGui.QPushButton): def __init__(self): QtGui.QPushButton.__init__(self, 'Choose File') self.mediaObject = Phonon.MediaObject(self) self.audioOutput = Phonon.AudioOutput(Phonon.MusicCategory, self) Phonon.createPath(self.mediaObject, self.audioOutput) self.mediaObject.stateChanged.connect(self.handleStateChanged) self.clicked.connect(self.handleButton) def handleButton(self): if self.mediaObject.state() == Phonon.PlayingState: self.mediaObject.stop() else: path = QtGui.QFileDialog.getOpenFileName(self, self.text()) #path = "test.mp3" if path: print path self.mediaObject.setCurrentSource(Phonon.MediaSource(path)) print self.mediaObject.currentSource().fileName() self.mediaObject.play() def handleStateChanged(self, newstate, oldstate): if newstate == Phonon.PlayingState: self.setText('Stop') elif newstate == Phonon.StoppedState: self.setText('Choose File') elif newstate == Phonon.ErrorState: source = self.mediaObject.currentSource().fileName() print 'ERROR: could not play:', source.toLocal8Bit().data() print self.mediaObject.errorString().toLocal8Bit().data()#查看报错的具体信息if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) app.setApplicationName('Phonon') win = Window() win.resize(200, 100) win.show() sys.exit(app.exec_()) 就是这段代码在ubuntu下正常,在win下报错
通过查看 media的errorString
print self.mediaObject.errorString().toLocal8Bit().data()#查看报错的具体信息
得到了错误信息是:
Pins cannot connect due to not supporting the same transport
经查找各方资料,得出的结论(已验证)是:音乐文件的ID3 tag有问题,(具体的mp3文件的结构见:)
在上看到了c++版的去掉ID3 tag的办法:
void removeTags(UDJ::DataStore::song_info_t& song){ static int fileCount =0; if(song.source.fileName().endsWith(".mp3")){ UDJ::Logger::instance()->log("On windows and got mp3, copying and striping metadata tags"); QString tempCopy = QDesktopServices::storageLocation(QDesktopServices::TempLocation) + "/striped" + QString::number(fileCount) +".mp3"; if(QFile::exists(tempCopy)){ UDJ::Logger::instance()->log("Prevoius file existed, deleting now"); if(QFile::remove(tempCopy)){ UDJ::Logger::instance()->log("File removal worked"); } } bool fileCopyWorked = QFile::copy(song.source.fileName(), tempCopy); if(!fileCopyWorked){ UDJ::Logger::instance()->log("File copy didn't work"); return; } TagLib::MPEG::File file(tempCopy.toStdString().c_str()); file.strip(); file.save(); Phonon::MediaSource newSource(tempCopy); song.source = newSource; if(fileCount == 3){ fileCount =0; } else{ fileCount++; } }} 在python中有专门的模块用来处理音频的metadata : ,文档在:
这里利用Tutorial中给出的示例,去掉了本地音乐文件的ID3 tag:
from mutagen.id3 import ID3audio = ID3("example.mp3")audio.delete()audio.save() 之后再次调用上面的测试代码,成功播放.
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