Public bug reported: Hi,
I am trying to make my first application in C++ with OpenCV, where I am trying to capture images from the built-in webcam on my Lenovo T450s. I use Eclipse CDT as my IDE to write code and debug. During several trials, sometimes I need to STOP running applications via Eclipse (probably through some interrupt signal). Whenever the application is interrupted, during the next run it cannot access the webcam and is returning "VIDIOC_STREAMON: Invalid argument" Apparently this is because resources are not released due to the interrupt. Also VLC cannot access webcam after I start seeing this error. Apparently there are 1-2 reports about this issue related to OpenCV and kernel, and there is also a workaround by handling SIGINT properly and correctly exiting. I could not work that solution in Eclipse, because probably Eclipse STOP button does not send SIGINT but some other signal. Nevertheless, I was expecting kernel to handle this in another way, so that resources would be released automatically to allow other applications to access webcam. However, webcam cannot be accessed after a program is interrupted. lsb_release -rd Description: Ubuntu 14.04.3 LTS Release: 14.04 uname -r 3.13.0-68-generic References: http://answers.opencv.org/question/28929/acquiring-video-from-webcam-problems/ http://askubuntu.com/questions/683327/libv4l2-error-turning-on-stream-invalid-argument-vidioc-streamon-invalid-argu https://lawlorcode.wordpress.com/2014/04/08/opencv-fix-for-v4l-vidioc_s_crop-error/ http://ubuntuforums.org/showthread.php?t=2298140 Please don't hesitate to ask for more information about the issue and correct me if my report isn't useful or sufficient. ** Affects: xawtv (Ubuntu) Importance: Undecided Status: New ** Tags: webcam -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518726 Title: Webcam cannot start after interrupted access with "VIDIOC_STREAMON: Invalid argument" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xawtv/+bug/1518726/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
