{"action":"created","issue":{"url":"https://api.github.com/repos/ros-perception/image_pipeline/issues/148","labels_url":"https://api.github.com/repos/ros-perception/image_pipeline/issues/148/labels{/name}","comments_url":"https://api.github.com/repos/ros-perception/image_pipeline/issues/148/comments","events_url":"https://api.github.com/repos/ros-perception/image_pipeline/issues/148/events","html_url":"https://github.com/ros-perception/image_pipeline/issues/148","id":103852516,"number":148,"title":"QMetaMethod::invoke: Unable to invoke methods with return values in queued connections","user":{"login":"TSC21","id":5048656,"avatar_url":"https://avatars.githubusercontent.com/u/5048656?v=3","gravatar_id":"","url":"https://api.github.com/users/TSC21","html_url":"https://github.com/TSC21","followers_url":"https://api.github.com/users/TSC21/followers","following_url":"https://api.github.com/users/TSC21/following{/other_user}","gists_url":"https://api.github.com/users/TSC21/gists{/gist_id}","starred_url":"https://api.github.com/users/TSC21/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/TSC21/subscriptions","organizations_url":"https://api.github.com/users/TSC21/orgs","repos_url":"https://api.github.com/users/TSC21/repos","events_url":"https://api.github.com/users/TSC21/events{/privacy}","received_events_url":"https://api.github.com/users/TSC21/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":3,"created_at":"2015-08-29T13:44:52Z","updated_at":"2015-09-01T06:59:59Z","closed_at":null,"body":"Hi there,\r\n\r\nI'm launching a usb camera node with has the following in the launch file:\r\n```xml\r\n<launch>\r\n  <node name=\"usb_cam\" pkg=\"usb_cam\" type=\"usb_cam_node\" output=\"screen\" >\r\n    <param name=\"video_device\" value=\"/dev/video0\" />\r\n    <param name=\"image_width\" value=\"640\" />\r\n    <param name=\"image_height\" value=\"480\" />\r\n    <param name=\"pixel_format\" value=\"mjpeg\" />\r\n    <param name=\"camera_frame_id\" value=\"usb_cam\" />\r\n    <param name=\"io_method\" value=\"mmap\"/>\r\n  </node>\r\n  <node name=\"image_view\" pkg=\"image_view\" type=\"image_view\" respawn=\"false\" output=\"screen\">\r\n    <param name=\"autosize\" value=\"true\" />\r\n  </node>\r\n</launch>\r\n```\r\nOn the terminal where I launch it, when it runs the `image_view` node I get:\r\n```bash\r\nQMetaMethod::invoke: Unable to invoke methods with return values in queued connections\r\n```\r\nSupposedly this was something corrected on a previous release but I'm getting it with version **1.12.14**. I'm on ROS Indigo, running on Ubuntu 14.04 LTS. Note: I'm using `opencv3` ROS package installed from `apt-get`.\r\n\r\nThanks in advance!"},"comment":{"url":"https://api.github.com/repos/ros-perception/image_pipeline/issues/comments/136608008","html_url":"https://github.com/ros-perception/image_pipeline/issues/148#issuecomment-136608008","issue_url":"https://api.github.com/repos/ros-perception/image_pipeline/issues/148","id":136608008,"user":{"login":"vrabaud","id":700766,"avatar_url":"https://avatars.githubusercontent.com/u/700766?v=3","gravatar_id":"","url":"https://api.github.com/users/vrabaud","html_url":"https://github.com/vrabaud","followers_url":"https://api.github.com/users/vrabaud/followers","following_url":"https://api.github.com/users/vrabaud/following{/other_user}","gists_url":"https://api.github.com/users/vrabaud/gists{/gist_id}","starred_url":"https://api.github.com/users/vrabaud/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vrabaud/subscriptions","organizations_url":"https://api.github.com/users/vrabaud/orgs","repos_url":"https://api.github.com/users/vrabaud/repos","events_url":"https://api.github.com/users/vrabaud/events{/privacy}","received_events_url":"https://api.github.com/users/vrabaud/received_events","type":"User","site_admin":false},"created_at":"2015-09-01T06:59:59Z","updated_at":"2015-09-01T06:59:59Z","body":"I totally missed you are using OpenCV3: image_pipeline is compiled with OpenCV2. Therefore, if you install the OpenCV3 package (which has a totally different API), it will try to use it and crash. I should probably have the packages conflict."}}