mythlcdserver is a program for displaying MythTV information on an LCD/VFD screen through LCDproc. This means you can have data from Myth (channel number, show name, current size of pause buffer,etc., etc.) displayed on an LCD screen. So ... possible to do things like play/advance music tracks without your TV having to be on. This can be enabled in the frontend settings.
MythTV 0.19.0 and prior can only communicate in the LCDProc 0.4.x protocol.
MythTV 0.20.0 and up should be able to communicate in both LCDProc 0.4.x and 0.5.x protocol versions. (this may be a build option?)
MythTV 0.21 only partially functions with LCDProc 0.5.3, (released June 2009). SVN and trunk versions may be able to. . The -fixes branch of MythTV 0.21 (released June 13, 2009 or later) has 0.5.3 support built in.
mythlcdserver is usually started up by the mythfrontend program. Whether or not it is started is governed by some settings in the mythfrontend Setup menu.
You can find the setup options in Utilities/Setup->Setup->Appearance->LCD device display. Check the "Enable LCD device" item and the following options will appear.
Display Time Display Menus Display Music Artist and Title items Artist -Title Artist [Album] Title Display Channel Information Display Recording Status Display Volume Information Display Generic Information Backlight Always On Heartbeat Always On Display Large Clock LCD Key order - ABCDEF Menu Pop-up Time : 5 (The time (in seconds) that the menu will remain visible after navigation.)
Running mythlcdserver from the Command Line
You can run from the commandline with the following options
> mythlcdserver Valid options are: -p or --port number A port number to listen on (default is 6545) -d or --daemon Runs lcd server as a daemon -n or --nodaemon Does not run lcd server as a daemon (default) -m or --startupmessage Message to show at startup -t or --messagetime How long to show startup message (default 30 seconds) -l or --logfile filename Writes STDERR and STDOUT messages to filename -v or --verbose debug-level Use '-v help' for level info -x or --debuglevel level Control how much debug messages to show [number between 0 and 10] (default 0)
Lengthy discussion regarding mythlcdserver on mythtv-user