minor bug fix

Both line 83 and 92 should delete the ".format"， i.e.
from  if (!video_->PixFormat().format.compare("YUV422P"))
to    if (!video_->PixFormat().compare("YUV422P")).
It cannot compile with ".format", since "video_->PixFormat()" is std::string format and should be followed by ".compare()" directly.