Question

我正在尝试使用OpenCV将视频写入磁盘。该代码使用视频编写器对象以.mpg格式保存文件，并以30帧/秒的速度保存。我已经使用CV_FOURCC宏指定了编解码器，如下所示：

VideoWriter put("test.mpg", CV_FOURCC('M','P','E','G'), 30, S);

当我执行代码时，我收到错误：

userk@dopamine:~/Development/opencv-2.4.8/sketch/RegVideo$ ./vi
HIGHGUI ERROR: V4L/V4L2: VIDIOC_S_CROP
OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv backend doesn't support this codec acutally.) in CvVideoWriter_GStreamer::open, file /home/userk/Development/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp, line 505
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/userk/Development/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp:505: error: (-210) Gstreamer Opencv backend doesn't support this codec acutally. in function CvVideoWriter_GStreamer::open

Aborted (core dumped)

我尝试过不同的编解码器，如MPEG-1，motion-jpeg，MPEG-4.2，MPEG-4.3，MPEG-4，H263，H263I和FLV1，但它们都没有奏效。问题似乎是V4L。

我尝试使用以下命令安装它，但是在make之后我遇到了错误：

wget http://www.linuxtv.org/downloads/v4l-utils/v4l-utils-0.9.3.tar.bz2
tar xvf v4l-utils-0.9.3.tar.bz2
cd v4l-utils-0.9.3
make
sudo make install

这是错误消息：

make [3]： * [qv4l2-moc_qv4l2.o]错误1 make [3]：离开目录/home/userk/Development/opencv-2.4.8/dependencies/v4l-utils-1.0.1/utils/qv4l2' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory / home / userk / Development / opencv-2.4.8 / dependencies / v4l-utils-1.0.1 / utils' make [1]： [all-recursive]错误1 make [1]：离开目录`/home/userk/Development/opencv-2.4.8/dependencies/v4l-utils-1.0.1' make：* * [all]错误2

v4l有什么问题？你有什么建议吗？

Answer 1

查看此帖子：IP camera video streaming using openCV in VC++。或者这一个http://opencv-srf.blogspot.fr/2011/09/capturing-images-videos.html。

使用OpenCV创建视频 - Gstreamer编解码器无法正常工作

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