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ros-drivers / video_stream_opencv

A package to open video streams and publish them in ROS using the opencv videocapture mechanism
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Failed to open nodelet #48

Closed ml-boringtao closed 5 years ago

ml-boringtao commented 5 years ago

Successfully show video by running: ./test_video_resource.py videofile However, when roslaunch video_stream_opencv video_file.launch video_stream_provider:=videofile Error msg shows:

[ERROR] [1565440225.383388393]: Failed to load nodelet [/videofile/videofile_stream] of type [video_stream_opencv/VideoStream] even after refreshing the cache: Failed to load library devel/lib//libvideo_stream_opencv.so. Make sure that you are calling the PLUGINLIB_EXPORT_CLASS macro in the library code, and that names are consistent between this macro and your XML. Error string: Could not load library (Poco exception = libyaml-cpp.so.0.5: cannot open shared object file: No such file or directory) [ERROR] [1565440225.383557928]: The error before refreshing the cache was: Failed to load library devel/lib//libvideo_stream_opencv.so. Make sure that you are calling the PLUGINLIB_EXPORT_CLASS macro in the library code, and that names are consistent between this macro and your XML. Error string: Could not load library (Poco exception = libyaml-cpp.so.0.5: cannot open shared object file: No such file or directory)

Can you help? thanks

furushchev commented 5 years ago

Hi, It seems the nodelet cannot be found in your environment. I guess you forgot to install necessary packages to be installed (did you run rosdep install before catkin build?) or you are using non-standard library for dependencies of this library (Are you using yaml-cpp installed by apt-get? If not, please use the standard one installable by using apt-get). If everything is ok, the nodelet video_stream_opencv/VideoStream should be listed when you run rosrun nodelet list_nodelets. Hope it will help you.

pdisho commented 5 years ago

Actually the issue is in the CMakeLists.txt when it's attempting to install the video_stream_node.

"install(TARGETS video_stream_node RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}"

This is saying install with the name video_stream_node but there isn't any target to actually install.

"install(TARGETS ${PROJECT_NAME} video_stream_node RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION} ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION} LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}"

This fixes it for me because now the target is video_stream_node.

furushchev commented 5 years ago

@pdisho Nice catch! I made a PR to fix the issue. #51 Please give me a feedback if exists :+1:

furushchev commented 5 years ago

@ml-boringtao Could you check if the error is fixed by using the PR I opened? #51

GrantDare commented 5 years ago

Hi @furushchev I can confirm #51 does solve the issue. I also experienced this issue, implemented the changes and now it works.

furushchev commented 5 years ago

@GrantDare Thank you for confirmation! I've now merged the PR. @ml-boringtao As for now, I close this issue since the PR #51 was merged. Please feel free to re-open the issue if it is not yet fixed.