[linux-dvb] Re: [v4l-dvb-maintainer] VBI OOPS 2.6.17.8

thomas schorpp t.schorpp at gmx.de
Tue Aug 15 23:17:00 CEST 2006


hunold at linuxtv.org wrote:
> Hello thomas,
> please forgive me, this is a webmail client.
> thomas schorpp writes:
> 
>> Michael Hunold wrote:
> 
> 
>> this is a known issue with the analogtuner part of siemens dvb-c, ive 
>> stated that in my mail with my patch, the tuner code is buggy and may 
>> oops with tvtime or kdetv, cause of their driver access/capture 
>> behaviour.
> 
> 
> Even when the application uses the API in a very "creative" way, it 
> should never result in an oops. Something is not correctly handled or 
> initialized, probably in my saa7146 vbi code.
> 
>>> This is about VBI capture on the *analog* parts of a DVB-C card, ie. on
>>> the analog cable channels that can be viewed through the saa711x on the
>>> saa7146 input channel b.
>>> What is the current status anyway? Did somebody ever got this to work?
>>
>>
>> yes, see list archives and attachment. CVBS imput and tuning is 
>> working here fine with xawtv since i created the patch.
>> the patch was created to be able to use the saa7113 input from the 
>> analog card extension board, i suggested to plug in an old VHS or 
>> other as tuner, since the tda9819 analog part of the siemens card is 
>> low analogtv-demodulation quality anyway...
> 
> 
> I know that tuning and using the cvbs input works, but I'm particularly 
> interested if VBI capturing ever worked.
> So: did anybody use VBI capturing on the analog input of a DVB-C card yet?
> 
>>> If not, then the easiest "fix" is to remove V4L2_CAP_VBI_CAPTURE from
>>> struct saa7146_ext_vv av7110_vv_data_c in av7110_v4l.c
>>
>>
>> objection, thats no solution so far.
> 
> 
> I did not mean to remove support for analog tv completely, just for the 
> vbi capturing parts.
> I tried to get it to work in 2004, but gave up when I realised that the 
> saa7113 and the saa7146 probably don't play together. IIRC it was not 
> possible that the BRS of the saa7146 correctly syncronizes to the 
> saa7113 output.
> If nobody has tried to get it to run since then, then I vote for doing 
> the "fix" I described in the other mail.
> Best regards
> Michael Hunold.
> 
> 

ah ok. thats another thing. capture to file using xawtv with streamer has worked, 
if its that what You mean... but I've got no more old VHS movies to sample...

I vote for OOPS removal too ;)

y
tom




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