---
name: "zapping_setup_fb"
section: "1"
platform: "linux"
package: "zapping"
version: "0.10~cvs6-16"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/zapping_setup_fb"
---

# zapping\_setup\_fb(1)

prepares V4L/V4L2 driver for overlay

## NAME

zapping\_setup\_fb - prepares V4L/V4L2 driver for overlay

## SYNOPSIS

**zapping\_setup\_fb** \[-?, -h, --help, --usage\] \[-b, --bpp *NUMBER*\] \[-c, --child\] \[-d, --device *FILENAME*\] \[-D, --display *NAME*\] \[-f, --fd\] \[-q, --quiet\] \[-S, --screen *SCREEN NUMBER*\] \[-v, --verbose\] \[-V, --version\]

## DESCRIPTION

**zapping\_setup\_fb** is a small program to prepare Video For Linux (V4L) or Video For Linux Two (V4L2) video capture drivers for video overlay. It must be executed by [**pam**(8)](/pam/8.md) with root privileges, or owned by root with the set-user-ID bit set (see [**chmod**(1)](/chmod/1.md)). This manual page refers to **zapping\_setup\_fb** version 0.13.

## BACKGROUND

To enable video overlay V4L and V4L2 drivers need to know the screen memory address. For security reasons only the system administrator can program this address. [**zapping**(1)](/zapping/1.md) delegates the task to this helper application.

## OPTIONS

- **-?, -h, --help, --usage**

  Prints usage information on stdout, then terminates the program.

- **-b, --bpp** *NUMBER*

  Color depth hint, the number of bits per pixel on the display in question, either 24 or 32. Usually **zapping\_setup\_fb** can determine this number automatically.

- **-c, --child**

  Zapping sets this flag when executing **zapping\_setup\_fb** as child process to enable the output of localized error messages in UTF-8 encoding on stderr.

- **-d, --device** *FILENAME*

  The video capture device to open, by default /dev/video0.

- **-D, --display** *NAME*

  The X display to use. Defaults to the name defined by the **DISPLAY** environment variable.

- **-f, --fd** *NUMBER*

  Zapping uses this option when executing **zapping\_setup\_fb** as child process to access the video capture driver by this shared file descriptor instead of opening the device file by name.

- **-q, --quiet**

  Decrements the verbosity level.

- **-S, --screen** *NUMBER*

  The X screen to use (Xinerama), defaults to 0.

- **-v, --verbose**

  Increments the verbosity level.

- **-V, --version**

  Prints the version of **zapping\_setup\_fb** on stdout, then terminates the program.

## BUGS

None known.

## SEE ALSO

[**zapping**(1)](/zapping/1.md), [**zapping\_remote**(1)](/zapping_remote/1.md), [**pam**(8)](/pam/8.md)

## AUTHORS

Zapping and **zapping\_setup\_fb** were written by Iñaki García Etxebarria, Michael H. Schimek (mschimek@users.sourceforge.net) and many contributors.

This manual page was written by Michael H. Schimek based on work by Christian Marillat.