[mythtv] [mythtv-commits] Ticket #4163: DVB-C in mythtv does not work while it works with mplayer/czap

[Rudy Zijlstra]

MythTV wrote:
> #4163: DVB-C in mythtv does not work while it works with mplayer/czap
> -----------------------------------+----------------------------------------
>  Reporter:  tobiaskaminsky at web.de  |        Owner:  danielk
>      Type:  defect                 |       Status:  new    
>  Priority:  minor                  |    Milestone:  unknown
> Component:  channelscan            |      Version:  head   
>  Severity:  medium                 |   Resolution:         
>   Mlocked:  0                      |  
> -----------------------------------+----------------------------------------
>
> Comment(by janne):
>
>   
Janne,
>  Replying to [comment:4 anonymous]:
>  > IMHO this bug is neither minor nor a candidate for an unknown milestone.
>
>  It is. Your cable provider is to blame. The transmits a NIT with DVB-S
>  delivery descriptor.
>   
We are talking here about - a likely very small - level 4 in Germany. 
This can be as small as 1 housing complex. A lot of these guys have 
neither the knowledge, nor the money to change their incoming signal to 
conform to DVB-C. What they typically do is to point a dish to Astra, 
receive the TSes, demodulate them, and re-modulate them into QAM64 and 
put them on the cable on some frequency. This they do with a 
de-modulator - re-modulator for each TS they handle. I suspect the 
smaller level 4 to have a fully independent de-modulator / modulator 
setup for each TS.

For a lot of them, the abbreviation "NIT" will, i suspect, get you a 
blank look. Followed by: But the STB's are taking this well, so why 
should i spent (significant) money on this? And they are typically 
running on a shoe-string for budget......

And yes, the STB manufacturers would love to see them go away, as they 
are a major headache to support in Germany.

The only way i am aware to handle such "networks" is a slow frequency 
scan, and to detect the services in each of the found TS. STB 
manufacturers are not happy with it, as it is slow and difficult to get 
fool-proof (you are not certain to which sat they are pointing, so 
additional info you would want to catch as well (EPG) may be difficult 
to handle).

So you are not alone in being unhappy with them.

I am still hoping for a better solution in Myth.

Rudy
>  > Basically this bug means that mythtv is unusable with DVB-C as mythtv
>  somehow
>  > mixes up the scan results with whatever data.
>
>  DVB-C with correct service information works as intended. Please try as
>  workaround to import a chnnels.conf.
>
>