QMediaPlayer 在 qt5 中不起作用答案

【问题标题】：QMediaPlayer doesn't work in qt5QMediaPlayer 在 qt5 中不起作用
【发布时间】：2013-10-07 17:20:03
【问题描述】：

我在 Mac OS X 10.8 和 Qt 5.1 上使用 Xcode 4.6。我想在我的应用程序中使用 QMeduaPlayer 类。这是我的代码：

#include <QApplication>
#include <QMediaPlayer>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMediaPlayer* pl = new QMediaPlayer();
    pl->setMedia(QUrl::fromLocalFile("Crashday.wav"));
    pl->play();
    a.exec();
}

但它不起作用，我在控制台中看到：

objc97058: Class AVFCaptureFramesDelegate is implemented in both /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqavfcamera.dylib and /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqavfcamera_debug.dylib. One of the two will be used. Which one is undefined.
objc97058: Class AVFMediaRecorderDelegate is implemented in both /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqavfcamera.dylib and /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqavfcamera_debug.dylib. One of the two will be used. Which one is undefined.
objc97058: Class AVFCameraSessionObserver is implemented in both /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqavfcamera.dylib and /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqavfcamera_debug.dylib. One of the two will be used. Which one is undefined.
objc97058: Class AVFMediaPlayerSessionObserver is implemented in both /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqavfmediaplayer.dylib and /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqavfmediaplayer_debug.dylib. One of the two will be used. Which one is undefined.
objc97058: Class TransparentQTMovieView is implemented in both /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqqt7engine.dylib and /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqqt7engine_debug.dylib. One of the two will be used. Which one is undefined.
objc97058: Class HiddenQTMovieView is implemented in both /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqqt7engine.dylib and /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqqt7engine_debug.dylib. One of the two will be used. Which one is undefined.
objc97058: Class QTMovieObserver is implemented in both /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqqt7engine.dylib and /Users/liri/Qt/5.1.1/clang_64/plugins/mediaservice/libqqt7engine_debug.dylib. One of the two will be used. Which one is undefined.

【问题讨论】：

标签： xcode qt5 xcode4.6 qmediaplayer

【解决方案1】：

试试

QMediaContent media(QUrl::fromLocalFile("Crashday.wav"));
pl->setMedia(media); 
pl->play();

确保 wav 文件与已编译的可执行文件位于同一目录中。将插槽连接到mediaStatusChanged signal 并在QMediaPlayer::MediaStatus 等于 QMediaPlayer::LoadedMedia 时从那里开始播放可能会更好。

【讨论】：