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    Running your command, I get Device '/dev/video0' is not a output device. How can I avoid this? Please help. Commented Oct 17, 2016 at 17:14
  • does /dev/video0 exist at all on your system ? Your camera might be mapped to another device. check which video devices exist, with eg "ls -l /dev/video*" install the "cheese" application and see which device supplies the video ... It might be /dev/video10 for example Commented Aug 10, 2019 at 13:52