[mythtv-users] DVB-C problems

Rudy Zijlstra mythtv at edsons.demon.nl
Wed Jan 3 00:47:17 UTC 2007


I've been trying to get my DVB-C card working, or rather, to get MythTv 
working with my cable operator. This means working around the assumption 
on Myth that all cable operators are fully standards compliant. Or 
rather, the assumption that all cable operators use DVB-C in the same 
manner. One of the assumptions here is that the NIT-Actual will describe 
the actual network layout. On DVB-C it is very common though, that 
several NIT-Other are present, which each describe the network layout 
for a particular geographical area. STB for these operators will present 
the user with a network-id choice, and the user has to type in the 
network id. The STB then searches for the NIT-Other with this 
network-id, and installs from there.

This goes against the MythTv assumptions.

I've tried to work around this by manual scanning, and taken the 
following steps:
- determine the frequencies used on my cable (dvbsnoop of frequency, and 
manual analysis of of relevant NIT-Other(s).
- enter found frequencies into dtv_multiplex
- let mythtv-setup perform scan of transports
- edit found channels to refer to correct transport stream instead of to 
incorrectly assumed transports from NIT-Actual
- delelete transports from NIT-Actual from dtv_multiplex, so they do not 
clutter the table (and cause confusion for me).

End result is that it still does not work, because siscanner will work 
from the NIT, and takes the NIT-Actual (judging from output from "-v 

As i am no coder, i would like pointers to continue this. I would very 
much like to be able to use my DVB-C card to record.



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