[mythtv-users] PCHD3000 - Blank Screen when trying to watch live tv

[R. G. Newbury]

Robert Tsai wrote:
> On Mon, Feb 06, 2006 at 11:04:14PM -0600, Richard Shaw wrote:
>   
>> Ok...
>>  I got the card installed (pcHDTV HD-3000)
>> Got the firmware in the right place
>> I downloaded the cvs version of dvb-apps and compiled it.
>> Can tune with azap and watch in mplayer (but not xine, it always 
>> complains about the last entry in my channels.conf)
>> Tried watching live tv and all I get is a blank screen.
>> Dug down into that and found that it couldn't read ringbuf1.nuv. After 
>> searching google for an hour I ran across taking a look at the output 
>> from mythbackend which is as follows...
>>
>> 2006-02-06 22:51:15.007 New DB connection, total: 1
>> Starting up as the master server.
>> 2006-02-06 22:51:15.023 New DB connection, total: 2
>> 2006-02-06 22:51:15.028 DVB#0 DVB SI Table Parser Started
>> 2006-02-06 22:51:15.029 DVB#0 Using DVB card 0, with frontend Oren 
>> OR51132 VSB/QAM Frontend.
>> 2006-02-06 22:51:15.040 New DB connection, total: 3
>> 2006-02-06 22:51:15.065 DVB#0 ERROR - Could not find dvb tuning 
>> parameters for transport 0
>> 2006-02-06 22:51:15.066 DVB#0 ERROR - Failed to get channel options for 
>> channel 3.
>> 2006-02-06 22:51:15.075 New DB scheduler connection
>> 2006-02-06 22:51:15.081 mythbackend version: 0.18.1.20050523-1 
>> www.mythtv.org
>> 2006-02-06 22:51:15.082 Enabled verbose msgs : important general
>> 2006-02-06 22:51:17.082 Reschedule requested for id -1.
>> 2006-02-06 22:51:17.123 Scheduled 0 items in 0.0 = 0.04 match + 0.00 place
>> 2006-02-06 22:51:17.125 Seem to be woken up by USER
>> 2006-02-06 22:51:25.089 New DB connection, total: 4
>> 2006-02-06 22:51:25.091 New DB connection, total: 5
>>
>> I searched on the DVB#0 ERROR fields and didn't run across anyting 
>> particulary useful. Channel 3 is a real channel here.
>> Any suggestions would be appreciated. Also, I would like to get xine 
>> working.. the error output is:
>> "There is no input plugin available for 'dvb://<last entry in 
>> channels.conf>
>>     
Xine maybe choking on a blank last line...that is, there is an extra 
blank line after what is properly the last channel entry.

>>
>> Did you run mythtv-setup, set up the new card, and scan for channels?
>>     
As to the DVB#0 error, this means that one or more of the entries 
required by myth to tune the channel are not present in the database.

For digital TV, there are multiple channels on the same frequency, 
differentiated by the pid or serviceid. The frequency is keyed to a 
value called the mplexid.
The channel number which we use, is nothing more than a shorthand 
convenience for the user and bears no relationship to any other reality 
(in particular to the reality of analog channels).

You have not said whether you have a cable or antenna input to your 
HD3000 card. In either case, the dtv_multiplex table needs to have the 
frequency entered,  the modulation type set (QAM_256 for cable) and then 
the mplexid for that frequency copied into the channel table for the 
particular channel, together with the serviceid.

As I understand it, the channel scan in recent SVN versions will enter 
the correct information if the scan is done against an OTA input. I know 
it does not do so for a cable input. Follow the procedure set out in 
'Jason Beck's.wiki' to find the serviceid for the channel and poke it 
into the channel table.

Geoff

-- 
       R. Geoffrey Newbury			
     Barrister and Solicitor
 Suite 106, 150 Lakeshore Road West
    Mississauga, Ontario, L5H 3R2

  905-271-9600  Fax 905-271-1638
       newbury at mandamus.org