.\" Hey, EMACS: -*- nroff -*-
.\" First parameter, NAME, should be all caps
.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
.\" other parameters are allowed: see man(7), man(1)
.TH VGRABBJ.CONF 5 "February 24, 2002"
.\" Please adjust this date whenever revising the manpage.
.\" Some roff macros, for reference:
.\" .nh disable hyphenation
.\" .hy enable hyphenation
.\" .ad l left justify
.\" .ad b justify to both left and right margins
.\" .nf disable filling
.\" .fi enable filling
.\" .br insert line break
.\" .sp <n> insert n+1 empty lines
.\" for manpage-specific macros, see man(7)
\fBvgrabbj.conf\fP \- configuration file for vgrabbj
vgrabbj purpose is to read data from a v4l-device and put it in a file,
formatted as jpeg, png, or pnm. Except for the ftp-options described
below everything can also handled on the commandline.
Here the configuration statements are described.
Syntax is <keyword> <value>. Comments start with a ';' or '#'. Those
lines are ignored by vgrabbj. Case of the keywords and named options
doesn't matter except for the timestamp option as well as any filename.
The configuration file is parsed line by line. If any keyword appears
twice or more often, the last one is the one used.
On startup, the pre-defined configuration file /etc/vgrabbj.conf is
read. Then, commandline parameters are evaluated one by one, the last is
the most significant, if one option is provide twice or more often.
Same applies for the commandline parameter \-c <config-file>.
.SH GENERAL OPTIONS
Daemonize & loop with \fIseconds\fP intervals (min. 1).
Daemonize & loop \fImicroseconds\fP intervals (min. 1). Same as \fB\-l\fP
except you can control it more precisely.
Defines if vgrabbj's brightness adjustment is used. This option works only
if the device supports data fetch via read and RGB24 videopalette. See
\fBForcePalette\fP on how-to set RGB24. Some device do not support RGB24,
hence, \fBBrightness\fP is ignored.
Sets the quality of a jpeg output to \fIquality\fP (1-100, default: 75).
Sets the imagesize of input device, where \fIimagesize\fP is one of:
sqcif= 128x96, qsif = 160x120,
qcif = 176x144, sif = 320x240,
cif = 352x288, vga = 640x480,
svga = 800x600, xga = 1024x768,
sxga = 1280x1024, uxga = 1600x1200,
Sets the width of the image to \fIwidth\fP. Needs \fB\-H\fP.
The v4l-device has to support the image width you set with
Sets the height of the image to \fIheight\fP. Needs \fB\-w\fP.
The v4l-device has to support the image height you set with
Sets the output to \fIformat\fP (either \fBjpeg\fP, \fBpng\fP, or
\fBpnm\fP, default: jpeg). Alternative, you may provide jpg for
Output is written to \fIfilename\fP (default: \fI/dev/stdout\fP)
Additional output is written to \fIpath/filename\fP (default: \fInot set\fP),
whereas the path-filename can include any strftime component. The path-
filename must not be on a different filesystem as the output defined above.
Additionally, you need to take care of the number of files stored. There is
no upper ceiling for archiving.
Sets the input device to \fIdevice\fP (default: \fI/dev/video\fP)
Defines if \fBvgrabbj\fP opens the device only while image data is grabbed
(\fIOff\fP) or keeps it opened while it is running (\fIOn\fP).
Setting it to \fIOff\fP is helpful if you need access to the device besides
vgrabbj. This use is discouraged though, due to possible problems with memory
fragmentation. Default is \fIOn\fP.
Defines if the image size (see \fB\-i\fP, \fB\-H\fP, and \fB\-w\fP) of the
device is set by vgrabbj. Necessary for certain v4l-devices which do not
support to be set to a particular image size (e.g. IBM-usb-cam, QuickCam).
For these devices you have to specify the size at module load time.
Default is \fIOn\fP.
Switches colormap from BGR to RGB (or vice versa) if set to \fIOn\fP. Default
is \fIOff\fP. Use if you have odd colors.
Swaps left and right of the image like a mirror. Default: Off.
Swaps top and bottom of the image like a mirror. Default: Off.
Turns off the use of mmap'ed (better) memory allocation for grabbing frames.
Some (very rare) cams cannot use mmap'ed memory and have to use read. If you
want to switch easily, use this switch. If you don't know what I'm talking
about, leafe it like it is: Default is \fIOff\fP.
Sets the loglevel of vgrabbj. Valid for \fIvalue\fP are 0, 2, 3, 4, 6, 7
(default: 4). 0 means no messages at all, 7 is debug. Don't use 7 if
you are running vgrabbj in daemon mode, it'll surely fill your syslog.
Be aware, that loglevel 7 will also post you ftp-password (if defined)
in the logfile!
Sets the use of the temporary outputfile. Default is \fIOn\fP. Ignored in case
the default output (\fI/dev/stdout\fP) is used. If set to \fIOff\fP, the data
is written directly to the file defined by \fBOutputFile\fP.
If \fIfilename\fP is different from \fI/dev/stdout\fP (given via \fB-f\fP
parameter or \fIOutputFile\fP, vgrabbj defaults to use a temporary file called
\fIfilename\fP.tmp to write the image. This file is then renamed to
\fIfilename\fP to shorten the time period corrupt data may be read from
Ask vgrabbj to launch an external program. May be used to pass the picture
through ImageMagick or others filters. The first '%s' instance in the command
line will be replaced with filename. If \fBUseTmpOut\fP is \fIOn\fP,
\fIcommands\fP will be run before the file is renamed.
Force the usage of the specified \fIpalette\fP. If \fIpalette\fP is not
supported by either \fBvgrabbj\fP or the v4l-device, fallback to a palette
supported by both is provided. If no common denominator is available, vgrabbj
exits. Supported palettes are marked with * below. Possible values are (copy
1 VIDEO_PALETTE_GREY Linear greyscale
2 VIDEO_PALETTE_HI240 High 240 cube (BT848)
3 VIDEO_PALETTE_RGB565 565 16 bit RGB
4 *VIDEO_PALETTE_RGB24 24bit RGB
5 *VIDEO_PALETTE_RGB32 32bit RGB
6 VIDEO_PALETTE_RGB555 555 15bit RGB
7 *VIDEO_PALETTE_YUV422 YUV422 capture
10 VIDEO_PALETTE_YUV411 YUV411 capture
11 VIDEO_PALETTE_RAW RAW capture (BT848)
12 VIDEO_PALETTE_YUV422P YUV 4:2:2 Planar
13 VIDEO_PALETTE_YUV411P YUV 4:1:1 Planar
14*VIDEO_PALETTE_YUV420P YUV 4:2:0 Planar
15 VIDEO_PALETTE_YUV410P YUV 4:1:0 Planar
(no default, depends on v4l-device).
\fIvalue\fP images are grabbed and immediately discarded. Only the
last image is written to the output. This might be helpful if your v4l-device
needs to take a couple of images to auto-adjust to the current light.
.SH ARCHIVE OPTIONS
The following options are useful if you want to keep a certain amount
of images in an archive. Currently, the archive is only supported if kept
on the same filesystem as the images taken.
The \fIarchive-filename-pattern\fP is evaluated as a timestring, hence
the same applies as to \fBTimeStamp\fP (see below, default: /tmp/arch/cam-%Y-%d-%m-%H-%M-%S.jpg)
Defines how many images have to be taken before a copy is made for the
archive. E.g. if defined 1, each image is put in the archive; if defined 5
every fifth image is put in the archive.
Sets the maximum number of images to be put in the archive.
.SH TIMESTAMP OPTIONS
The following options are available only if vgrabbj was compiled with
the freetype library available. The timestamp will only be enabled if
all values evaluated (including defaults) lead to a valid configuration
and UseTimestamp is set to On.
This is the essential setting to enable timestamps
if defined in the config file. Without this being set
to On, it just won't work (although, if there are options
set to have an invalid configuration, it won't work either).
This is different to the handling on the commandline.
The TrueType font to be used for the timestamp
Set the fontsize to \fIsize\fP for timestamp (3-100, default: 12).
Defines the timestamp. \fIformat-str\fP can be plain text or any
strftime format. Any '""' at the beginning or the end will be eliminated
for compatibility reasons, i.e. they are not necessary (default: "%a, %e.
%B %Y \- %T" \- see \fBstrftime\fP(3) for details).
Alignment of the timestamp in the image. Possible
ul = upper left, ur = upper right,
ll = lower left, lr = lower right,
uc = upper center, lc = lower center
(default: upper right). You can use either the short or the long version.
Defines the blend between font background and image (1-100, default: 60).
\fIvalue\fP pixels will be used as border around the timestamp string (1-255,
.SH FTP OPTIONS
There are no options for ftp-upload on the command line. This is due to the need
to provide a password which would be visible via the \fBps\fP(1) command.
Ftp-Connection will only be opened if set to \fIOn\fP. Be aware that this
might bring up a dial-up connection. See also \fBKeepAlive\fP. (default: Off)
Host to which a ftp-connection will be established everytime an image has
been written (see also: \fBDaemon\fP, \fBDaemonSeconds\fP, \fBKeepAlive\fP,
The \fIpath\fP consists of the full path on the remote host defined by
\fBRemoteHost\fP (default: /).
The \fIfilename\fP consists of the full path and filename on the remote host
defined by \fBRemoteHost\fP (default: foo.bar.com).
The name of the user to log on the remote ftp-server (default: foo).
The password of the user to log on the remote ftp-server (default: bar). Be
aware, that the password is kept unencrypted in memory, it might be read by
If set to \fIOn\fP, the connection will be kept. This will cause a dial-up
line to be up all the time, which in turn may cost a lot of money! If set
to \fIOff\fP, the connection will be established after an image was written
to the \fBOutputFile\fP. After transmission, the ftp-connection will be ended.
This may also result in phone charges, for which Author takes no responsibility. See License.
If set to \fIOn\fP, passive ftp will be used. This can help connecting to
ftp servers from the inside of a NAT-ed network.
Not implemented, yet.
.SH HARDWARE SETTINGS
With the following options you may alter the settings of your hardware (the cam), if
supported by the cam. Be aware, this might break your hardware, as there are no checks
if the values supplied are valid, allowed, or supported!
At my own machine running vgrabbj, the %F in a Archive-Filename causes memory corruption.
This is not validated by any other machine. No further bugs are known at this time.
.SH SEE ALSO
\fBvgrabbj\fP(1), \fBstrftime\fP(3), \fBps\fP(1)
This manual page was originally written by Michael Janssen
<email@example.com>, for the Debian GNU/Linux system and enhanced by
Jens Gecius <firstname.lastname@example.org>.