opencv 写视频错误
使用opencv 写入视频出错cv::VideoWriter writer;
writer.open("1.mp4", cv::VideoWriter::fourcc('m', 'p', '4', 'v'), saveFps, cv::Size(saveW, saveH), false);
//writer.isOpened() 返回 0
并且有下面提示：
Could not find a valid device can't configure encoderCould not open codec 'mpeg4_v4l2m2m': Unspecified error[ WARN:1] global ../modules/videoio/src/cap_gstreamer.cpp (1580) open OpenCV | GStreamer warning: cannot link elements
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