[英]QMediaPlayer gives me wrong informations about video
I'm trying to implement a server terminal application which inspects video files. 我正在尝试实现一个检查视频文件的服务器终端应用程序。 I need to get informations like audio/video codec, resolution, bitrate, length, etc.
我需要获取音频/视频编解码器,分辨率,比特率,长度等信息。
I found most of the needed information in QMediaResource . 我在QMediaResource中找到了大多数所需的信息。 After reading multiple examples, I came to this:
阅读多个示例后,我得出以下结论:
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QMediaPlayer media;
media.setMedia(QUrl::fromLocalFile("/home/danbru1211/Videos/S01E01.mp4"));
QObject::connect(&media, &QMediaPlayer::mediaStatusChanged,
[&media](QMediaPlayer::MediaStatus status){
qDebug() << status;
auto resource = media.media().canonicalResource();
qDebug() << "language" << resource.language();
qDebug() << "audioCodec" << resource.audioCodec();
qDebug() << "videoCodec" << resource.videoCodec();
qDebug() << "dataSize" << resource.dataSize();
qDebug() << "audioBitRate" << resource.audioBitRate();
qDebug() << "sampleRate" << resource.sampleRate();
qDebug() << "channelCount" << resource.channelCount();
qDebug() << "videoBitRate" << resource.videoBitRate();
qDebug() << "resolution" << resource.resolution();
});
return a.exec();
}
But sadly this does not output the right meta data: 但是遗憾的是,这不会输出正确的元数据:
QMediaPlayer::LoadedMedia
language ""
audioCodec ""
videoCodec ""
dataSize 0
audioBitRate 0
sampleRate 0
channelCount 0
videoBitRate 0
resolution QSize(-1, -1)
I am sure the path of the video exists and is readable. 我确定视频的路径存在并且可读。 Why do I get all 0 values and not the correct ones.
为什么我得到所有0值而不是正确的值。 Is this the right/best way to get meta informations about a video file in Qt?
这是在Qt中获取有关视频文件的元信息的正确/最佳方法吗?
Given the fact that QtMultimedia in general is pretty much broken, you should listen to QMediaObject::metaDataChanged (inherited by QMediaPlayer ). 考虑到QtMultimedia一般都已损坏,您应该收听QMediaObject :: metaDataChanged (由QMediaPlayer继承)。
However, I warn you that this is broken on Windows and most likely macOS too. 但是,我警告您,这在Windows上以及很可能在macOS上也已损坏。 I've reported several QTBUG and they just don't care.
我已经报告了几个QTBUG ,它们只是不在乎。
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