[mythtv] saa7134 vbi problem ?

marek mark_kiddy at wp.pl
Mon Aug 27 07:53:45 UTC 2007


Hi group
i have problem with VBI/Pal teletext in mythtv

Hardware :
geniatech DVB-S (cx88) looks like :
   cx88[0]: subsystem: 14f1:0084, board: Geniatech DVB-S 
[card=52,autodetected]
   cx88[0]: TV tuner type 4, Radio tuner type -1
   ...
   cx88[0]/0: registered device video3 [v4l2]
   cx88[0]/0: registered device vbi3
   ...
   cx88/2: cx2388x dvb driver version 0.0.6 loaded
   cx88/2: registering cx8802 driver, type: dvb access: shared
   cx88[0]/2: subsystem: 14f1:0084, board: Geniatech DVB-S [card=52]
   cx88[0]/2: cx2388x based DVB/ATSC card

and
KNC One TV Station DVR
   saa7134[0]: subsystem: 1894:a006, board: KNC One TV-Station DVR 
[card=24,autodetected]
   ....
   tuner 0-0060: type set to 38 (Philips PAL/SECAM multi (FM1216ME MK3))
   saa6752hs 0-0020: saa6752hs: chip found @ 0x40
   saa7134[0]: registered device video1 [v4l2]
   saa7134[0]: registered device vbi1
   saa7134[0]: registered device radio1
   saa7134 ALSA driver for DMA sound loaded
   saa7134[0]/alsa: saa7134[0] at 0xfdeffc00 irq 17 registered as card 1
   saa7134[0]: registered device video0 [mpeg]


so it looks rather ok.
I can watch, record, switch between channels, inputs, etc
but when I try menu -> toggle teletext menu - see "P100 Page not 
available" on every channel - source independent.
all analog channels have very good signal - when I use tvtime for 
watching analog tv - and alevt for teletext it works without problems 
(but alevt needs patch for using it with saa7134 - without this patch it 
can't decode vbi data - look at this patch here : 
http://marc.info/?l=linux-video&m=104135131408201&w=2), cat /dev/vbi1 
shows data stream..

mythtv-setup has vbi inputs properly configured (for saa7134 /dev/vbi1, 
PAL-Teletext)
fuser /dev/vbi1 while watching analog shows /dev/vbi1 is used by 
mythbackend.
Logs doesn't show any VBI  problem

Maybe this is sth. wrong with decoding (v4l2 or saa7134 related?) or 
maybe I miss something - how i can debug  this ?

 
Regards
Marek K.


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