"QV4L2" "1" "March 2015" "v4l-utils @PACKAGE_VERSION@" "User Commands"
 NAME
qv4l2 - A test bench application for video4linux devices

 SYNOPSIS
 qv4l2 [-R] [-h] [-d <dev>] [-r <dev>] [-V <dev>] [-S <dev>]

 DESCRIPTION
The qv4l2 tool is used to test video4linux capture and output devices, either video, vbi,
radio or swradio. This application can also serve as a generic video/TV viewer application
or as a video generator for video output devices.


However, it does not (yet) support compressed video streams other than MJPEG

 OPTIONS

-d, --device=<dev>
Use device <dev> as the video device. If <dev> is a number, then /dev/video<dev> is used.


-V, --vbi-device=<dev>
Use device <dev> as the vbi device. If <dev> is a number, then /dev/vbi<dev> is used.


-r, --radio-device=<dev>
Use device <dev> as the radio device. If <dev> is a number, then /dev/radio<dev> is used.


-S, --sdr-device=<dev>
Use device <dev> as the SDR device. If <dev> is a number, then /dev/swradio<dev> is used.


-R, --raw
Open device in raw mode, i.e. without using the libv4l2 wrapper functions.


-h, --help
Prints the help message.

 HOTKEYS
 Main Window

Ctrl + O
Open device


Ctrl + R
Open device in raw mode


Ctrl + W
Close the device


Ctrl + V
Start capture


Ctrl + F
Resize Capture Window to frame size


Ctrl + Q
Exit the application

 Capture Window

Ctrl + W
Closes the window and stops capture


Ctrl + F
Resize Capture Window to frame size

 EXIT STATUS
On success, it returns 0. Otherwise, it will return the error code.

 BUGS
Report bugs to Hans Verkuil <hverkuil@xs4all.nl>