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

yavta 0.0+git20210522.65f740a                      August 2021                                          YAVTA(1)