Channel tuning broken with DVB-C
Contents
Whats wrong ?
With some cable providers scanning for channels seem to work fine, but its not possible to tune the channels. Two problems are known:
1. Some provider change the modulation of satellite feeds for DVB-C but don't modify the device information. One have to scan each frequency manually but there is no way around it.
2. These providers have different regional channel lineups but generate the SI in a central place. They transmit for each region one NIT all the time. The DVB standard has a flag to indicate whether a NIT is for the actual network or for an other network. This information is not correct for all but one of the regional networks. One has to know the network id to get the correct network information table.
There is only one simple solution for these problems: Talk to your cable provider they need fix it!
How can we fix it ?
See both the (workaround) patch provided by Janne and the script at the problem ticket for this issue:
http://svn.mythtv.org/trac/ticket/3640
modified mythic.pl solution
1. Install MythTV as usual
$ apt-get install mythtv
2. Create a czap channels.conf
You need (dvb)scan and w_scan.
Warning: This will take several hours!
At least on my machine running this combination of (dvb)scan, w_scan and different parameters finds more channels than a simple scan.
3. Import into MythTV
Import czap-final.txt (created in step 2) into MythTV.
4. Fix database with modified mythic.pl
This script will fix the database and enable EIT on all channels. Its a modified version of mythic.pl, because channel names dont match exactly depending on the different scanners.
$ /etc/init.d/mythbackend stop
$ mythic-ignore_channel_name.pl myusername mypassword ./czap-final.txt
$ /etc/init.d/mythbackend start
5. Profit!
Broken providers
Netherlands
Ziggo (previously called @home)
Contacted them about this problem (knowing it would not help)... They WONT fix it. All of their supported boxes have the possiblity to enter the frequency and network number, this way their boxes work perfectly. I would't change my network either if I was them, most boxes have this feature so why changing it?
2008/10/13 the above scanall.sh did not work for me with ziggo, (ex @home area) I had to use the frequency list to scan with "scan nl-ziggo-frequency-list This gave me the channels.conf list.
France
Germany
Germany has some major providers and several small/regional providers (around 50% of population is forced to use the smaller broken ones).
atcable.de/cablevista.de
Resells to: Kabel Medien Service Muenchen, ...
State: 2008-06-26 Broken The modified mythic solution worked for me!
Technical support told me that they copy the NIT directly from SAT, because the dont know any receiver which has problems with this. They WONT fix it.
Funk & Technik (http://www.kabel-net.de/) and AVC (http://www.avc-online.de)
~ 50% of the cable network from Cottbus/Germany
State: 2008-06-26 Broken
NIT/NIT-o directly from Astra 19.2E and They WONT fix it.
