[trogggy]

I use a couple of little scripts to enable / disable dvbviewer.
The default.py for disabling is simply:

Code:

#!/usr/bin/python
# -*- coding: utf-8 -*-
#import xbmc,xbmcgui,xbmcplugin
import xbmc

xbmc.executeJSONRPC('{"jsonrpc":"2.0","method":"Addons.SetAddonEnabled","id":8,"params":{"addonid":"pvr.dvbviewer","enabled":false}}')

Change the addonid to mythtv, add an addon.xml, zip it up and install - make another with enabled:true and do likewise.
Then use

Code:

xbmc-send --action="RunScript(script.whatever)"

That - or something like it - should work. I switched from using start / stop pvrmanager when I moved to krypton.
I don't do the last part though - I enable via the gui - so the command may not be exactly right RunScript is a built-in function though, so it should work.