[vlc] Re: DVB?

[Jan Ekholm]

On Wed, 21 Apr 2004, Jean-Paul Saman wrote:

>Jan,
>
>Could you try frequency=12552000 ? Thus:
>
>vlc -vvvv
>dvb:frequency=12552000:polarization=v:fec=5:srate=22000000:lnb-lof2=21500000
>--probe

Same logfile, just reload it.


>Jan Ekholm wrote:
>> On Wed, 21 Apr 2004, Jean-Paul Saman wrote:
>>>I like to check the tuning parameters for the channel you are trying to
>>>tune to with VLC. Are you trying to tune VIVA channel?
>>>
>>>The following satellite information is found by me for the VIVA channel
>>>on different sites:
>>>
>>>According to http://www.lyngsat.com/astra19.shtml the following
>>>parameters are needed.
>>>
>>>frequency 12552
>>>fec 5/6 (auto should also work)
>>>srate=22000000
>>>polarization=V
>>>
>>>The transponder settings according to
>>>http://www.pirmasoft.de/astra/trnsp108.htm
>>>
>>>Transponder: 12.55150 GHz
>>>Polarization: vertical
>>>Receiver: 2,802 MHz
>>
>>
>> Yes, that's the one that I have used for tests. Just using 12251 has
>> always worked fine for dvbstream, szap and xawtv, My mistake.
>
>With dvbstream, szap and xawtv you provide the frequency in GHz, while
>the DVB driver expects them in kHz. This is not very well documented ;-(

Ah, this sounds logical. However, vlc does write that it expects kHz if
you feed it some out of range values, at least when using -vvvv.

>The DVB input of VLC expects them in the same unit as the DVB driver,
>which also allows for tuning some other frequencies that can not be
>(easily) tuned by these other applications.
>
>>>The vlc commandline then becomes:
>>>
>>>vlc -vvvv
>>>dvb:frequency=12551500:polarization=v:fec=5:srate=22000000:lnb-lof2=21500000
>>>--probe
>>
>
>>
>> What does the lnb-lof2 actually do? I've seen in mentioned on Google a few
>> times, but never together with any real info.
>>
>The lnb-slof is the frequency at which the switch to high frequency band
>is done. It will result in programming the tuner PLL to another
>frequency range then in the low frequency band. lnb-lof1 and lnb-lof2
>will be used to calculate the right frequency to give to the tuner, like
>this:
>
>(frequency - lnb-lof1) is used when frequency < lnb-slof
>(frequency - lnb-lof2) is used when frequency >= lnb-slof

Ok, this is something I have to read up a bit on. The whole tuning issue
and how it works behind the scenes is fairly dark rocket magic to me. :)


--
'Educational' refers to the process, not the object. Although, come to think
of it, some of my teachers could easily have been replaced by a cheeseburger.
                                   -- Terry Pratchett, alt.fan.pratchett

-- 
This is the vlc mailing-list, see http://www.videolan.org/vlc/
To unsubscribe, please read http://www.videolan.org/support/lists.html
If you are in trouble, please contact <postmaster at videolan.org>