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我如何找出正在使用V4L2网络摄像头的进程?
我尝试运行以下命令: $ vlc -I dummy v4l2:///dev/video0 --video-filter scene --no-audio --scene-path webcam.png --scene-prefix image_prefix --scene-format png vlc://quit --run-time=1 VLC media player 2.0.7 Twoflower (revision 2.0.6-54-g7dd7e4d) [0x1f4a1c8] dummy interface: using the dummy interface module... [0x7fc19c001238] v4l2 demux error: VIDIOC_STREAMON failed libv4l2: error setting pixformat: Device or resource busy libv4l2: error setting pixformat: …