QV4L2

Section: User Commands (1)
Updated: March 2015
Page Index

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>