[mythtv] DVB-C and MythTV

Rudy Zijlstra mythtv at grumpydevil.homelinux.org
Fri Aug 17 23:39:14 UTC 2007

Rudy Zijlstra wrote:
> Christiaan van Dijk wrote:
>> Hi all,
>> I've been working on a MythTV box with a DVB-C card and ran into some 
>> problems. I solved quite some issues and would like to share these here.
>> A known problem with DVB-C are the network IDs. In a normal DVB 
>> situation there's only one main network ID in the NIT which describes 
>> the used network. In DVB-C however the network ID needs to be entered 
>> manually and is not even located in the NIT but in NITo. I've seen 
>> some discussion on how to deal with this since it's not really DVB 
>> standard and solutions are mainly dirty hacks which only pollute the 
>> code. I tried a solution which is a bit in between (to my opinion :-) 
>> ), this solution makes it possible to give a network ID in the 
>> configuration script which is compiled into the code, if not defined 
>> (default) the code stays in it's original state. There is some code 
>> pollution with the conditional defines but I tried to keep it to a 
>> minimum.
>> To use a fixed network ID simply add the option --dvb-net-id=1111 to 
>> the configuration script (for network ID 1111).
>> There still is a bug in the standard code for handling the NITo 
>> tables, the buffering of the different sections needs to take the 
>> network ID into account since the NITo tables can and will include 
>> multiple network IDs. This could be tricky since there could be up to 
>> 64k-1 IDs in theory. The patch avoids this problem by only 
>> interpreting the NITo/NIT with the matching network ID as main NIT.
>> Also fixed a bug in the channel inversion setting, the scanner used to 
>> set an invalid value for DVB-C, now it defaults to auto. Really minor 
>> but avoids warnings in the log files.
> Hi  Christiaan,
> Have you kept these current with SVN? i just tried a scan on the @home 
> transports in order to update my channels, as they are apparently no 
> longer up to date. And completely failed with current SVN, as it no 
> longer sees the DVB tables. Updating them is now a real pain.
> Have not yet tried to apply to current SVN, will try that tomorrow.
> Cheers,
> Rudy

tried on current SVN, and i get:
root at satje:/home/svn/mythtv/mythtv# patch -p 2 < 
patching file libs/libmythtv/channelutil.cpp
Hunk #1 succeeded at 278 (offset 1 line).
patching file configure
Hunk #1 succeeded at 154 (offset 36 lines).
Hunk #2 FAILED at 433.
Hunk #3 FAILED at 1160.
Hunk #4 FAILED at 2668.
Hunk #5 FAILED at 3402.
4 out of 5 hunks FAILED -- saving rejects to file configure.rej
patching file libs/libmythtv/mpeg/dvbstreamdata.cpp
Hunk #1 succeeded at 7 with fuzz 2 (offset 1 line).
Hunk #2 succeeded at 218 (offset 18 lines).
Hunk #3 succeeded at 270 (offset 13 lines).
Hunk #4 succeeded at 288 (offset 18 lines).

As i am not exactly a coder, that pretty much blocks me...




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