Failed to open /dev/video0: No such file or directory

Usage: Common options: -d, --device=<dev> Use device <dev> as the video device. If <dev> starts with a digit, then /dev/video<dev> is used. -V, --vbi-device=<dev> Use device <dev> as the vbi device. If <dev> starts with a digit, then /dev/vbi<dev> is used. -r, --radio-device=<dev> Use device <dev> as the radio device. If <dev> starts with a digit, then /dev/radio<dev> is used. -S, --sdr-device=<dev> Use device <dev> as the SDR device. If <dev> starts with a digit, then /dev/swradio<dev> is used. -t, --touch-device=<dev> Use device <dev> as the touch device. If <dev> starts with a digit, then /dev/v4l-touch<dev> is used. -e, --expbuf-device=<dev> Use device <dev> to obtain DMABUF handles. If <dev> starts with a digit, then /dev/video<dev> is used. only /dev/videoX devices are supported. -s, --streaming=<count> Enable the streaming tests. Set <count> to the number of frames to stream (default 60). Requires a valid input/output and frequency (when dealing with a tuner). For DMABUF testing --expbuf-device needs to be set as well. -f, --stream-all-formats Test streaming all available formats. This attempts to stream using MMAP mode or read/write for one second for all formats, at all sizes, at all intervals and with all field values. -a, --stream-all-io Do streaming tests for all inputs or outputs instead of just the current input or output. This requires that a valid video signal is present on all inputs and all outputs are hooked up. -c, --stream-all-color=color=red|green|blue,skip=<skip>,perc=<percentage> For all formats stream <skip + 1> frames and check if the last frame has at least <perc> percent of the pixels with a <color> component that is higher than the other two color components. This requires that a valid red, green or blue video signal is present on the input(s). If <skip> is not specified, then just capture the first frame. If <perc> is not specified, then this defaults to 90%. -h, --help Display this help message. -n, --no-warnings Turn off warning messages. -T, --trace Trace all called ioctls. -v, --verbose Turn on verbose reporting. -w, --wrapper Use the libv4l2 wrapper library.