[mythtv-users] [mythtv] saa7134 vbi problem ?

[Martin Barnasconi]

On Monday 27 August 2007 09:53:45 marek wrote:
> 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..

the 'analog' teletext is not captured from /dev/vbi but is decoded from the 
MPEG stream. This is true for PVR/IVTV-based cards and DVB cards. 

> 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

For which stream are you trying to capture vbi?  Pure
analog cards (without MPEG encoder/output) are not supported.

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

you could check with -v vbi

Rgds, Martin

> Regards
> Marek K.
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