Re: DVB Simulcrypt

["Tycho Lürsen" <tycholursen@gmail.com>]

Op 23-02-15 om 13:44 schreef Rudy Zijlstra:
> On 23-02-15 12:21, Honza Petrouš wrote:
>> 2015-02-23 11:31 GMT+01:00 Rudy Zijlstra 
>> <rudy@grumpydevil.homelinux.org>:
>>> On 23-02-15 08:44, Honza Petrouš wrote:
>>>
>>> Hi Rudy.
>>>
>>> 2015-02-22 16:28 GMT+01:00 Rudy Zijlstra 
>>> <rudy@grumpydevil.homelinux.org>:
>>>> Some more info
>>>>
>>>> On 21-02-15 22:30, Rudy Zijlstra wrote:
>>>>> Dears (Hans?)
>>>>>
>>>>> My setup, where the cable operator was using only irdeto, was working
>>>>> good. Then the cable operator merged with another, and now the 
>>>>> networks are
>>>>> being merged. As a result, the encryption has moved from irdeto 
>>>>> only to
>>>>> simulcyrpt with Irdeto and Nagra.
>>>>>
>>>>> Current status:
>>>>> - when i put the CA card in a STB, it works
>>>>> - when trying to record an encrypted channel from PC, it no longer 
>>>>> works.
>>>> Recording system has 3 tuners. All equal, all with same permissions 
>>>> on the
>>>> smartcard. On cards 0 and 2 does not work, but card 1 does work, on 
>>>> all
>>>> channels tested.
>>>>
>>> Does it mean that descrambling is not working for you? If so,
>>> how do you manage descrambling? By CI-CAM module
>>> or by some "softcam" like oscam?
>>>
>>> Or do you record ENCRYPTED stream and decrypt the recordings
>>> later on?
>>>
>>>
>>> Each tuner has its own legal CI-CAM module. And yes, except for the 
>>> second
>>> tuner descrambling no longer works
>>>
>> I'm not much familiar with MythTV, so I'm guessing from the mux setup 
>> changes,
>> but did you check to descramble the same channel on different tuners?
>> To eliminate
>> the particular change inside one service only.
>>
>> Of course there can be also software issue in CI-CAM module itself
>> (fail in parsing
>> PMT CA descriptors etc).
>>
>> TBH, I think it must be application layer issue, not kernel one.
>>
> See above:
>
> Recording system has 3 tuners. All equal, all with same permissions on 
> the
> smartcard. On cards 0 and 2 does not work, but card 1 does work, on all
> channels tested.
>
> additional finfo: i tested the same channel(s) on all 3 tuners. For 
> now i have re-configured mythtv to use only the second tuner for 
> encrypted channels.
> This does reduce scheduling flexibility though.
>
> Would to understand what makes the difference, so i can ask the right 
> questions to MythTV developers.
>
>
> As the decryption does work with 1 tuner, i see 2 options:
> - depending on tuner id the default CA descriptor used is different, 
> and this selection is not expoerted on API level (kernel issue)
> - application needs to select which CA to use (and currently does not 
> do this)
>
It should be the latter one. I'm also having  Ziggo for provider, but 
always used FFdecsawrapper/Oscam for decryption (also legal in The 
Netherlands, providing you have a paid subscription)
ECM CA system id's 0x604 or 0x602 (depending on your region) gets you 
Irdeto, while ECM CA system id's 0x1850 or 0x1801 get you Nagra.
Correctly configured FFdecsa/Oscam can deal with it, MythTV probably cannot.
Check it out at: 
http://www.dtvmonitor.com/nl/?guid=0BE90D25-BA46-7B93-FDCD-20EFC79691E0
That's a snapshot from today, monitored from Groningen.

Cheers,

Tycho.