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我将带封面的 mp3 媒体设置为QMediaPlayer,我调用QMediaPlayer::isMetaDataAvailable()它并返回 true,然后我调用QMediaPlayer::availableMetaData(),它返回以下内容:

("Author", "AverageLevel", "Description", "PeakValue", "Title", "WM/AlbumArtist", "WM/AlbumTitle", "WM/Composer", "WM/ContentGroupDescription", "WM/Genre", "WM/Picture", "WM/Track", "WM/TrackNumber", "WM/Year")

如果我打电话给QMediaPlayer::metaData(QMediaMetaData::Title).toString()它,它会返回正确的标题。但由于某种原因,以上所有内容都只返回空虚:

qDebug()<< player->metaData(QMediaMetaData::CoverArtImage).toString();
qDebug()<< player->metaData(QMediaMetaData::CoverArtUrlLarge).toString();
qDebug()<< player->metaData(QMediaMetaData::CoverArtUrlLarge).toString();
qDebug()<< player->metaData(QMediaMetaData::CoverArtUrlSmall).toString();
qDebug()<< player->metaData(QMediaMetaData::PosterImage).toString();
qDebug()<< player->metaData(QMediaMetaData::PosterUrl).toString();

我不明白为什么。有人可以给我任何建议吗?

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