---
name: "yavta"
section: "1"
platform: "linux"
package: "yavta"
version: "0.0+git20220328.c7b5b75-1"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/yavta"
---

# yavta(1)

Yet Another V4L2 Test Application

## 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