FFMPEG音视频开发：获取flv视频格式的时长

    QProcess process;
    process.setProcessChannelMode(QProcess::MergedChannels);
    process.start("C:/FFMPEG/ffmpeg_x86_4.2.2/bin/ffprobe.exe -i D:/test1080.flv");
    process.waitForFinished();
    process.waitForReadyRead();
    QString str  = process.readAllStandardOutput();
    process.close();

    //分析字符串
    const char *src=str.toStdString().c_str();
    char *p1=strstr(src,"Duration");
    if(p1)
    {
        int addr=p1-src;
        str = str.mid(addr+10);
        str =str.section(',', 0,0);

        qDebug("视频的时长(标准时间):%s",str.toStdString().c_str());

        //解析数据
        QTime t1=QTime::fromString(str);
        int time_ms=t1.hour()*60*60*1000+t1.minute()*60*1000+t1.second()*1000+t1.msec();
        qDebug()<<"最视频的时长(MS):"<<time_ms;

        //反向解析回来对比
        qDebug()<<"还原视频的时长(标准时间):"<<QTime(0,0,0,0).addMSecs(int(time_ms)).toString(QString::fromLatin1("HH:mm:ss.zzz"));
    }

视频的时长(标准时间):00:06:37.15
最视频的时长(MS): 397150
还原视频的时长(标准时间): "00:06:37.150"