mp4v2录制音视频同步方法

#include
long long getSystemTime() {
    struct timeb t;
    ftime(&t);
    return 1000 * t.time + t.millitm;

}

long long nowvoltime;

long long tempvoltime=getSystemTime();

while(1)

[

nowvoltime=getSystemTime();

//写入音频第五个参数48000是采样率，这个参数应填入录制一针花费时间*一毫秒的份数，48000实际是一针对时间分成了48000份，除以1000获得一毫秒的份数：（当前时间-初始时间）*48000/1000

//写入视频和音频一样，但是48000改成90000，

MP4WriteSample(mp4lei.hMp4file, mp4lei.audio, pbAACBuffer, nRet,(nowvoltime-tempvoltime)*48000/1000, 0, 1);//MP4_INVALID_DURATION

MP4WriteSample(hMp4File, m_videoId, data, datalen,(nowvoltime-tempvoltime)*48000/1000, 0, 1)；//写音频

MP4WriteSample(hMp4File, m_videoId, data, datalen,(nowvoltime-tempvoltime)*90000/1000, 0, 1)；写视频

tempvoltime=nowvoltime;

}