NAME

       yavta - Yet Another V4L2 Test Application

SYNOPSIS

       yavta [options] device

DESCRIPTION

       Supported options: -B, --buffer-type               Buffer type ("capture", "output",

              "capture-mplane" or "output-mplane")

       -c,  --capture[=nframes]          Capture  frames  -C,  --check-overrun             Verify
       dequeued frames for buffer overrun -d, --delay                     Delay  (in  ms)  before
       requeuing buffers -f, --format format             Set the video format

              use -f help to list the supported formats

       -F, --file[=name]               Read/write frames from/to disk

              For  video capture devices, the first '#' character in the file name is expanded to
              the frame sequence number. The default file name is 'frame-#.bin'.

       -h,   --help                        Show   this   help   screen    -i,    --input    input
       Select  the  video  input  -I,  --fill-frames               Fill frames with check pattern
       before queuing them -l, --list-controls             List available controls -n, --nbufs  n
       Set the number of video buffers -p, --pause[=n]                 Pause after n frames (0 if
       n isn't specified) -q, --quality n                 MJPEG quality (0-100) -r, --get-control
       ctrl           Get  control  'ctrl'  -R,  --realtime=[priority]        Enable  realtime RR
       scheduling -s,  --size  WxH                   Set  the  frame  size  -t,  --time-per-frame
       num/denom   Set the time per frame (eg. 1/25 = 25 fps) -u, --userptr                   Use
       the user pointers streaming method -w, --set-control 'ctrl value'  Set control  'ctrl'  to
       'value'

       --buffer-prefix
              Write portions of buffer before data_offset

       --buffer-size
              Buffer size in bytes

       --enum-formats
              Enumerate formats

       --enum-inputs
              Enumerate inputs

       --fd   Use a numeric file descriptor insted of a device

       --field field
              Set the format field order

              Valid  values  for  field  are  none,  top,  bottom,  interlaced,  seq-tb,  seq-bt,
              alternate, interlaced-tb and interlaced-bt.

       --log-status
              Log device status

       --no-query
              Don't query capabilities on open

       --offset
              User pointer buffer offset from page start

       --premultiplied
              Color components are premultiplied by alpha value

       --queue-late
              Queue buffers after streamon, not before

       --requeue-last
              Requeue the last buffers before streamoff

       --reset-controls
              Reset all available controls to their default value

       --timestamp-source
              Set timestamp source on output buffers [eof, soe]

       --skip n
              Skip the first n frames

       --sleep-forever
              Sleep forever after configuring the device

       --stride value
              Line stride in bytes