[mythtv] Re: [mythtv-commits] Re: Ticket #264: PMT always onfailsCRC check

[Torbjörn Jansson]

mythtv-dev-bounces at mythtv.org <> wrote:
> Torbjörn Jansson wrote:
>>>> (In [7169]) Fixes #264.
>>>> 
>>>> The "VLSI VES1x93 DVB-S" and "Philips TDA10046H DVB-T" DVB
>>>> cards occasionaly munge the PMT. The PMT is still readable
>>>> but the CRC check fails. This commit changes MythTV so that
>>>> it does not do a CRC check on the PMT for these cards
>>> 
>>> Sorry - I just realised. These aren't card names. They're the names
>>> of the frontends. Which don't have any effect on the datastream,
>>> hence special-casing them doesn't help. It's the model / type of
>>> the DVB card
>>> that matters, AFAIK.
>>> 
>> 
>> 
>> How can they not affect the datastream when they do error checking
>> and correction? 
>> 
> 
> ... Because the error is happening above this level. The
> specific cards
> I have the issue with are 'fully featured' cards, which use
> an ARM CPU
> with firmware that does the section filter. Daniel is suggesting that
> the card is rewriting the section incorrectly in the filter.
> 
> I'm not completely convinced of this, since dvbsnoop seems to
> show the
> right CRC value.
> 

I have a dvb-ttpci card, one of those full featured cards a dvb-c card and i
don't think i've had the pmt crc problem.
But my card have one of those ves1820 frontends that are sensitive to the
powersuply in the computer.
I've changed psu 3-4 times before i found one that didn't cause bad
reception.

Maybe the kernel version matters? I'm running 2.6.12