Question

这是我在终端中运行的命令，rosrun ros_exploration ros_exploration之后，出现如下意外错误。应该指出的是，GStreamer: cannot put pipeline to play可能是此操作的重点问题。不幸的是，我不知道该如何解决。

0:00:04.442429649  3130      0x2071c90 ERROR                    omx gstomx.c:3249:plugin_init: Failed to load configuration file: Valid key file could not be found in search dirs (searched in: /home/htf/.config:/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg:/usr/local/etc/xdg as per GST_OMX_CONFIG_DIR environment variable, the xdg user config directory (or XDG_CONFIG_HOME) and the system config directory (or XDG_CONFIG_DIRS)
0:00:04.990602557  3078 0x7fd5a8002e70 ERROR           GST_PIPELINE grammar.y:816:priv_gst_parse_yyparse: no element "Video"

(ros_exploration:3078): GStreamer-CRITICAL **: gst_element_make_from_uri: assertion 'gst_uri_is_valid (uri)' failed
0:00:04.990762618  3078 0x7fd5a8002e70 ERROR           GST_PIPELINE grammar.y:971:priv_gst_parse_yyparse: no source element for URI "/18_09_11-11:44:53-PCL.avi"
GStreamer Plugin: Embedded video playback halted; module filesink0 reported: Could not open file "Video/18_09_11-11:44:53-PCL.avi" for writing.
GStreamer Plugin: Embedded video playback halted; module filesink0 reported: GStreamer error: state change failed and some element failed to post a proper error message with the reason for the failure.
OpenCV Error: Unspecified error (GStreamer: cannot put pipeline to play
) in CvVideoWriter_GStreamer::open, file /home/htf/Downloads/opencv-2.4.13.6/modules/highgui/src/cap_gstreamer.cpp, line 1528
Qt has caught an exception thrown from an event handler. Throwing
exceptions from an event handler is not supported in Qt. You must
reimplement QApplication::notify() and catch all exceptions there.

terminate called after throwing an instance of 'cv::Exception'
  what():  /home/htf/Downloads/opencv-2.4.13.6/modules/highgui/src/cap_gstreamer.cpp:1528: error: (-2) GStreamer: cannot put pipeline to play
 in function CvVideoWriter_GStreamer::open

Aborted (core dumped)

如果您曾经使用过GStreamer或遇到了相关的问题和解决方案，将不会有什么线索。

这是相关代码的一部分，

PCL_VideoWriter.open（FileName.toAscii（）。data（），CV_FOURCC（'M'，'P'，'2'，'V'），FPS，cv :: Size（640,480））; // MainTimer-> start（viewer_thr-> loop_time）;

    if(SLAM_IMG_Capture_flag == 1)
    {
        FileName.clear();
        FileName =  "Video/"+CurrDateText+"-"+CurrTimeText+"-SLAM"+".avi";

我尝试重新编译OpenCV-2.4.13。这是我的命令，cmake cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local/opencv-2.4.13 -D WITH_FFMPEG=ON ..＆make＆

`sudo make install`

。然后我得到了

     Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  YES (ver 2.2.1)
--     FFMPEG:                      YES
--       avcodec:                   YES (ver 58.18.100)
--       avformat:                  YES (ver 58.12.100)
--       avutil:                    YES (ver 56.14.100)
--       swscale:                   YES (ver 5.1.100)
--       avresample:                YES (ver 1.0.1)
--     GStreamer:                   
--       base:                      YES (ver 1.15.0.1)
--       video:                     YES (ver 1.15.0.1)
--       app:                       YES (ver 1.15.0.1)
--       riff:                      YES (ver 1.15.0.1)
--       pbutils:                   YES (ver 1.15.0.1)

但是，错误是error: ‘CV_CAP_FFMPEG’ was not declared in this scope或error: ‘CAP_FFMPEG’ is not a member of ‘cv’仍然存在。

Answer 1

从我所见，您正在尝试打开视频文件而不是gstreamer管道。对于这种情况，使用opencv的FFMPEG接口可能会更有用。 VideoWriter类具有一个overload function：

bool cv::VideoWriter::open  (   const String &      filename,
    int     apiPreference,
    int     fourcc,
    double      fps,
    Size    frameSize,
    bool    isColor = true 
)

您可以像这样使用它：

PCL_VideoWriter.open(FileName.toAscii().data(),CAP_FFMPEG,CV_FOURCC('M','P','2','V'),FPS,cv::Size(640,480));
    //        MainTimer->start(viewer_thr->loop_time);

此外，视频的路径是否正确，即“ Video / 18_09_11-11：44：53-PCL.avi”？

GStreamer：无法播放管道

1 个答案: