alevt-date(1) [redhat man page]
ALEVT-DATE(1) Teletext time ALEVT-DATE(1) NAME
alevt-date - display/set time received via Teletext SYNOPSIS
alevt-date [options] DESCRIPTION
alevt-date displays the time received from a Teletext source. It can be used to set the system time. The date is not interpreted (not even transmitted on most channels). So it allows only adjustment of +/-12 hours. The default allowed adjustment is limited to +/-2 hours (use -delta to change). Without the -set option it just displays the date in the format of the date(1) command. OPTIONS
A summary of options is included below. -set Set system time from time received via Teletext. -delta seconds Maximum allowed adjustment made to the system time. The default is 7200 seconds (2 hours) and the maximum that may be given is 12 hours. -format string Format string to used to print the time. Look at strftime(3) for possible control sequences. -vbi device Use the given device name. Default: /dev/vbi, /dev/vbi0, /dev/video0, /dev/dvb/adapter0/demux0 tried in this order. -timeout seconds If the time can't be detected in seconds, the program is terminated with a SIGALRM. -progname name Specifies the program name if using the DVB interface. -pid pid Specifies the teletext PID if using the DVB interface. --help Show summary of options. --version Show version of program. Before starting this program, you have to set the TV channel with another program like xawtv of set-tv. Note: This program does not set the battery backed up clock of your computer. clock -w will do this. The -progname or -pid option specifies the program or teletext PID if using the DVB interface. If neither of these two options is used, alevt outputs informations about the currently accessible streams and uses the first of these PIDs as default. This output contains the PIDs and names that can be used as an input for the -progname or -pid option in the context of the currently chosen TV channel. FILES
/dev/vbi* /dev/dvb/adapter*/demux* SEE ALSO
alevt(1x), alevt-cap(1), strftime(3), date(1), clock(8). BUGS
This program is just a toy. The time transmitted by the TV stations is more than inaccurate. Some are within a few seconds of your local time reference but others are more then 15 minutes off. You've been warned. (And don't assume the pkt8/30 time is better. It's even worse.) No bug reports to <froese@gmx.de> *g*. LINUX 1.6.2 ALEVT-DATE(1)
Check Out this Related Man Page
ALEVT(1x) Teletext decoder ALEVT(1x) NAME
alevt - X11 Teletext browser SYNOPSIS
alevt [options] DESCRIPTION
alevt is an X11 program for browsing and searching Teletext pages received by a compatible decoder (at the moment, bttv). OPTIONS
A summary of command line options is included below. The X11 user interface is described in the built-in manual. -display display Where to display the windows. Default: $DISPLAY. -geometry geometry Specifies the size and position of the windows. Default: 40x25. -vbi device Use the given device name. Default: /dev/vbi0. -finetune -4..4|auto Try some fine tuning if you have a lot of decoding errors (these lightning symbols). This allows fine tuning of the decoder circuit. The pre finetune behaviour was -finetune 0. Default: 1. [-parent] ppp[.ss] Open a new window with the page number given by ppp and an optional subpage index given by ss. The -parent keyword is just for completeness and not normally used. The page number alone is sufficient. Default: 900. -child ppp[.ss] Open a new child window with the page number given by ppp and an optional subpage index given by ss. About the concept of parent and child windows see the built-in manual. -erc/-noerc Enables/disables the error reduction code which substitutes errors on a page by data from a previously received one. Enabled by default. -bell/-nobell Enables/disables the error bell. Normally enabled. -charset latin-1|latin-2 Selects the character set to use. Characters not present in the selected set are replaced by similar looking symbols. (default: latin-1) -progname (dvb only) Selects the station name to display. -pid (dvb only) Selects the station pid to display. -outfile (dvb only) Specifies a file where the available stations are written. --help Show summary of options. --version Show version of program. The order of options is important! Each page number opens a new window with the previously given geometry, device, and display. For exam- ple, to open two windows on the local display and one on display foo:0 you would start it with: alevt 100 300 -display foo:0 100 Or, one window from /dev/vbi0 and one from /dev/vbi1 (untested *g*): alevt -vbi /dev/vbi0 100 -vbi /dev/vbi1 100 The -child options requires a parent window. So, it must be preceded by a parent or another child window. To access the DVB interface, use: alevt -vbi /dev/dvb/adapter0/demux0 When saving pages alevt asks for a format string. Look at alevt-cap(1). The chapter Format Specifiers gives an explanation. alevt has no support to set or change the TV channel. This should be done with another (not supplied) program like xawtv or set-tv from the xawtv package. Maybe in the future there will be a more sophisticated method in bttv to switch channels etc with a dedicated tuner application. But, at the moment, you have to live with it... FILES
/dev/vbi* SEE ALSO
alevt-date(1), alevt-cap(1), X(3x), xawtv(1x), and the built-in manual. BUGS
There are no known bugs. If you find one, please report it to <froese@gmx.de>. LINUX
1.6.2 ALEVT(1x)