[linux-dvb] DVB-S tuning problems

Alexander Abraham abrahix at yahoo.de
Tue Nov 8 19:22:59 CET 2005


Hello @ll,

i am not able to tune in some transponders with VLC. I also posted this
question to the VLC mailinglist without a solution at the moment. This
problem regards following tuning situation...

vlc --color dvb: --dvb-frequency=11836000 --dvb-srate=27500000
--dvb-voltage=18 --dvb-fec 3 --dvb-satno 2
--> works :)

now changing to --dvb-frequency=12669000 --dvb-srate=22000000
--dvb-voltage=13 --dvb-fec 5 --dvb-satno 2
--> does not work :( via gui. I have to close vlc and have to start this
transponder via commandline.

I think i am not able to change to another transponder which has another
dvb-srate and/or dvb-fec. Also i am not able to change my LNBs with a
DiSEqC command via gui, only commandline is working.

But i had a look into the verbose output from vlc. The frequency, srate,
fec, voltage are the right one to tune in.

Could it also be a dvb driver problem?

I tried this...
vlc -vvv --color dvb: --dvb-frequency=10832000 --dvb-srate=22000000
--dvb-voltage=18 --dvb-fec 5 --dvb-satno 2 &> vlc,tuning,07.11.2005.txt

After opening the playlist and tuning to transponder...
#EXTINF:0,Viacom, MTV
#EXTVLCOPT:dvb-frequency=11739000
#EXTVLCOPT:dvb-srate=27500000
#EXTVLCOPT:dvb-voltage=13
#EXTVLCOPT:dvb-fec 3
#EXTVLCOPT:dvb-satno 2

... the following happens in the debug output...
[00000348] main input debug: set input option: dvb-frequency to 11739000
[00000348] main input debug: set input option: dvb-srate to 27500000
[00000348] main input debug: set input option: dvb-voltage to 13
[00000348] main input debug: waiting for thread completion
[00000348] main input debug: `dvb://' gives access `dvb' demux `' path `'
[00000348] main input debug: creating demux: access='dvb' demux='' path=''
[00000349] main demuxer debug: looking for access_demux module: 0 candidates
[00000349] main demuxer warning: no access_demux module matched "dvb"
[00000348] main input debug: creating access 'dvb' path=''
[00000350] main access debug: looking for access2 module: 5 candidates
[00000350] dvb access debug: Opening device /dev/dvb/adapter0/frontend0
[00000350] dvb access debug: Frontend Info:
[00000350] dvb access debug:   name = ST STV0299 DVB-S
[00000350] dvb access debug:   type = QPSK (DVB-S)
[00000350] dvb access debug:   frequency_min = 950000 (kHz)
[00000350] dvb access debug:   frequency_max = 2150000 (kHz)
[00000350] dvb access debug:   frequency_stepsize = 125
[00000350] dvb access debug:   frequency_tolerance = 0
[00000350] dvb access debug:   symbol_rate_min = 1000000 (kHz)
[00000350] dvb access debug:   symbol_rate_max = 45000000 (kHz)
[00000350] dvb access debug:   symbol_rate_tolerance (ppm) = 500
[00000350] dvb access debug:   notifier_delay (ms) = 0
[00000350] dvb access debug: Frontend Info capability list:
[00000350] dvb access debug:   inversion auto
[00000350] dvb access debug:   forward error correction 1/2
[00000350] dvb access debug:   forward error correction 2/3
[00000350] dvb access debug:   forward error correction 3/4
[00000350] dvb access debug:   forward error correction 5/6
[00000350] dvb access debug:   forward error correction 7/8
[00000350] dvb access debug:   forward error correction auto
[00000350] dvb access debug:   card can do QPSK
[00000350] dvb access debug: End of capability list
[00000350] dvb access debug: trying to tune the frontend...
[00000350] dvb access debug: frequency 11739000 is in Ku-band
[00000350] dvb access debug: using inversion=2
[00000350] dvb access debug: using fec=5
[00000350] dvb access debug: using voltage=13
[00000350] dvb access debug: using tone=1
[00000348] main input debug: thread 2991311792 (input) created at priority 0 (src/input/input.c:230)
[00000350] dvb access debug: Opening device /dev/dvb/adapter0/dvr0
[00000350] dvb access debug: setting filter on PAT
[00000350] dvb access debug: Opening device /dev/dvb/adapter0/demux0
[00000350] dvb access debug: DMXSetFilter: DMX_PES_OTHER for PID 0
[00000350] dvb access debug: Opening device /dev/dvb/adapter0/ca0
[00000350] dvb access debug: CAMInit: CA interface with 1 slot
[00000350] dvb access debug: CAMInit: CI link layer level interface type
[00000350] dvb access debug: CAMInit: 0 available descramblers (keys)
[00000033] main module debug: using access2 module "dvb"
[00000351] main private debug: pre buffering
[00000350] dvb access debug: frontend has acquired signal
[00000350] dvb access debug: frontend has acquired carrier
[00000350] dvb access debug: frontend has lost carrier
[00000350] dvb access debug: frontend has acquired carrier
[00000350] dvb access debug: frontend has lost carrier
[00000350] dvb access debug: frontend has acquired carrier
[00000350] dvb access debug: frontend has lost carrier
[00000350] dvb access debug: frontend has acquired carrier
[00000350] dvb access debug: frontend has acquired stable FEC
[00000350] dvb access debug: frontend has lost carrier
[00000350] dvb access debug: frontend has lost FEC
[00000350] dvb access debug: frontend has acquired carrier
[00000350] dvb access debug: frontend has acquired stable FEC
[00000350] dvb access debug: frontend has lost carrier
[00000350] dvb access debug: frontend has lost FEC
[00000350] dvb access warning: no lock, tuning again
[00000350] dvb access debug: using inversion=2
[00000350] dvb access debug: using fec=5
[00000350] dvb access debug: using voltage=13
[00000350] dvb access debug: using tone=1
[00000350] dvb access debug: frontend has acquired signal
[00000350] dvb access debug: frontend has acquired carrier
[00000350] dvb access warning: no lock, tuning again
[00000350] dvb access debug: using inversion=2
[00000350] dvb access debug: using fec=5
[00000350] dvb access debug: using voltage=13
[00000350] dvb access debug: using tone=1
[00000350] dvb access debug: frontend has acquired signal
[00000350] dvb access debug: frontend has acquired carrier
[00000001] main vlc debug: removing all interfaces

The first thing i thought was, that the signal is to weak. But under
Windows the signal is shown with over 90percent, also the signal to
noise ratio. There is no tuning problem.

Could someone give me a hint?

OS: Debian
Kernel: 2.6.14-1-k7
VLC: 0.8.4-svn20040920
DVB-S card: KNC ONE TV Station DVB-S (saa7146, stv0299)

Hardware is ok, i tested the system with the delivered software from KNC
under Windows.

Thank you for any help,
Alexander Abraham


	

	
		
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