Migration
If you want to migrate between Tvheadend instances, one possible approach is to configure your new instance in advance, reading your muxes via http. Of course if you have a large number of muxes, just loading on by one could be tedious, so it's better to do it programmatically. Refer to the attached script.¶

This script has been tested on migrating a 3.4 server to a 3.9 server.

#!/usr/bin/env python
import time
import urllib
import urllib2
import json
#Source IP of your TVHeadend Server
ipsrc='192.168.0.9'
#Target IP
ipdst='192.168.0.254'
#Old Network Name
onn='Astra28'
#New Network UUID
nnu='7cc8273901fadc4f5e8b65a4bca392fd'
url = 'http://'+ipsrc+':9981/api/mpegts/mux/grid?start=0&limit=400'
url=urllib2.urlopen(url)
json_string=url.read()
data = json.loads(json_string)
entries = data['entries']
if entries:
    for entry in entries:
        if entry['network']==onn:
            print "Creating MUX: ' + entry['name']
            conf = { 'enabled' : 'true',
                       'epg' : 0,
                       'scan_state' : 0,
                       'iptv_url' : 'http://'+ipsrc+':9981/stream/mux/' + entry['uuid'],
                       'iptv_interface' : 'eth0',
                       'iptv_atsc' : '',
                       'iptv_muxname' : entry['name'],
                       'iptv_sname' : '',
                       'charset' : '',
                       'pmt_06_ac3' : '',
                       'priority' : 0,
                       'spriority' : 0,
                   }
            data = { 'uuid' : nnu,
                     'conf' : json.JSONEncoder().encode(conf),
                   }
            posturl = 'http://'+ipdst+':9981/api/mpegts/network/mux_create'
            postdata = urllib.urlencode(data)
            req = urllib2.Request(posturl, postdata)
            response = urllib2.urlopen(req)
            the_page = response.read()
            print "Sleeping for 60 seconds to allow initial scan" 
            time.sleep(60)