[vlc] Re: DVB-T tuning problem

[Sebastien PAUSET]

Hi,

I have some news.
I think some parameters (guard interval for exemple) are not correctly 
sent to the dvb frontend.
I did the following test:
Manually tune the frontend with dvbtune:
> root at koenig:~# dvbtune -f 586000000 -c 2 -tm 8 -I 2 -gi 8
> Using DVB card "DiBcom 3000MC/P"
> tuning DVB-T (in United Kingdom) to 586000000 Hz
> polling....
> Getting frontend event
> FE_STATUS:
> polling....
> Getting frontend event
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_SYNC
> Bit error rate: 2097151
> Signal strength: 34685
> SNR: 0
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_SYNC

looks great.
then I check the adapter current parameters:

> root at koenig:~# dvbsnoop -adapter 2 -s feinfo
> (...)
>
> Current parameters:
>     Frequency:  586000.000 kHz
>     Inversion:  AUTO
>     Bandwidth:  8 MHz
>     Stream code rate (hi prio):  FEC 3/4
>     Stream code rate (lo prio):  FEC 1/2
>     Modulation:  QAM 64
>     Transmission mode:  8k mode
>     Guard interval:  1/8
>     Hierarchy:  none
ok.
then I launch VLC with the following VLM config file section:

> new R1 broadcast enabled
> setup R1 input dvb://
> setup R1 option dvb-adapter=2
> setup R1 option ts-es-id-pid
> setup R1 option programs=257,259,260,261,262,273
> setup R1 option dvb-frequency=586000000
> setup R1 option sout-standard-access=udp
> setup R1 option sout-standard-mux=ts
> setup R1 option dvb-guard=8
> setup R1 option dvb-transmission=8
> setup R1 output 
> #duplicate{dst=std{dst=239.255.40.2},select="program=257",dst=std{dst=239.255.40.3},select="program=259",dst=std{dst=239.255.40.4},select="program=260",dst=std{dst=239.255.40.5},select="program=261",dst=std{dst=239.255.40.9},select="program=262",dst=std{dst=239.255.40.10},select="program=273")
tuning still fails, and if I check the adapter current setting, I get:

> root at koenig:~# dvbsnoop -adapter 2 -s feinfo
> (...)
> Current parameters:
>     Frequency:  586000.000 kHz
>     Inversion:  AUTO
>     Bandwidth:  AUTO
>     Stream code rate (hi prio):  FEC 1/2
>     Stream code rate (lo prio):  FEC 1/2
>     Modulation:  QPSK
>     Transmission mode:  2k mode
>     Guard interval:  1/32
>     Hierarchy:  none
As you can see, the guard interval and the transmission mode are not the 
one I specified in the config file.

Is there a priority for options?
Any idea?

Thanks

regards, Sebastien.




Sébastien PAUSET wrote:
> Christophe Massiot a écrit :
>> On Sun, Feb 25, 2007, Sébastien PAUSET wrote:
>>
>>  
>>> thank you for your response,
>>> unfortunately, I already tried to add these offset values, and it 
>>> doesn't help.
>>> I tried +/-166000, +/-332000 and +/-498000.
>>> I still got the error message
>>> [00000387] [Média: France5] dvb access warning: no lock, tuning again
>>> [00000355] [Média: France2] dvb access warning: no lock, tuning again
>>> [00000374] [Média: France3] dvb access warning: no lock, tuning again
>>> [00000381] [Média: LCP] dvb access warning: no lock, tuning again
>>> I keep on looking for a solution, thank you very much for your fast 
>>> responses.
>>>     
>>
>> Make sure that you do not have a vlcrc preferences file lying around,
>> and delete it if it does. You may also want to specify the guard
>> interval manually.
>>
>> And yes, one card per frequency is enough :).
>>   
>
> Thanks a lot :-)
> I'll check that.
> I think I already tried to set the guard interval manually, but I'm 
> not sure (did so many tests :-p )
> I'll try that again.
>
> I will send you a feedback.
>
> Thank you very much once again for your responses.
>

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