针对qt4的(视频格式为rgb32)

 

  v4l_grab_movie(&v4l_dev);

  unsigned char *pBuffer= v4l_dev.buffer;

  QImage image(pBuffer,320,240,QImage::Format_RGB32);

  QPixmap pixmap;

  pixmap=pixmap.fromImage(image);

  label->setPixmap(pixmap);

  label->setFixedSize(pixmap.width(),pixmap.height());