获取相机图像帧被阻塞
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为什么在运行到ioctl(m_fd, VIDIOC_DQBUF, &buf)这个函数，程序会被阻塞住，我添加了两个相机，但只有一个相机会出现这种情况，但是流模式下两个相机都可以正常预览画面
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@lin 请表述的更清楚一点。
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@veye_xumm 解决了，重启后，可以了
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