如题，其position就是准确的position，这里我给出测试代码：（大概原理就是有两个timer，一个timer会让QMediaPlayer在某个时候pause()，并在pause()之后输出一个pause完毕的瞬间获取的position；另一个timer则高频率获取QMediaPlayer的position()，这样子对比pause完毕的瞬间输出的position和后续高频率timer输出的position就可以知道pause()后的position还有没有变化，如果没有变化那么pause()后瞬间获取的position就是准确的）

    QMediaPlayer *player = new QMediaPlayer;
    QAudioOutput *audioOutput = new QAudioOutput;
    audioOutput->setVolume(0.5);
    player->setAudioOutput(audioOutput);
    player->setSource(QUrl::fromLocalFile("C:/Users/me/Music/1.flac"));


    QTimer *timer_10s = new QTimer;
    timer_10s->setSingleShot(true);
    timer_10s->setTimerType(Qt::PreciseTimer);
    timer_10s->setInterval(16350);

    QTimer *timer_1ms = new QTimer;
    timer_1ms->setSingleShot(false);
    timer_1ms->setTimerType(Qt::PreciseTimer);
    timer_1ms->setInterval(1);

    QObject::connect(timer_10s, &QTimer::timeout, [=](){
        player->pause();
        qDebug() << "paused pos:" <<  player->position();
    });

    QObject::connect(timer_1ms, &QTimer::timeout, [=](){
        qDebug() << "pos:" <<  player->position();
        // if(!player->isPlaying())
        //     timer_1ms->stop();
    });

    player->play();
    timer_10s->start();
    timer_1ms->start();

注意包含一下头文件：

#include <QMediaPlayer>
#include <QAudioOutput>
#include <QDebug>
#include <QTimer>

输出如下

pos: 16213
pos: 16213
pos: 16213
paused pos: 16213
pos: 16213
pos: 16213
pos: 16213
pos: 16213

所以pause()过后获取的position是精确的