[mythtv] [mythtv-commits] Ticket #2884: mythbackend crashes in ProgramAssociationTable::toString()

[Simon Kenyon]

Daniel Kristjansson wrote:
> On Sun, 2007-01-07 at 23:11 +0000, Simon Kenyon wrote:
>   
>> MythTV wrote:
>>     
>>> #2884: mythbackend crashes in ProgramAssociationTable::toString()
>>>  Duplicate of #2664.
>>>       
>> ok, i see that it is a duplicate
>> but, it used to work
>>
>> are you saying that my hardware is at fault, because i haven't changed 
>> it in many months
>> and for what it is worth, 2664 is for DVB-T, while i'm using DVB-S (with 
>> a pretty good signal from my dish - used by 4 sat receivers as well as 
>> these two cards)
>>     
>
> The signal has probably dropped a little since you set it up.
> MythTV relies on the CRC to verify a table, but there are two
> problems with this. 1/ Some DVB cards, and especially DVB-S
> cards, rewrite the PMT without fixing the CRC, so we must
> disable the CRC checking for these cards. 2/ We treat PSIPs
> as if they were PES packets in the MPEG parser and so we check
> the CRC flag on the packets, but PSIPs don't have a CRC flag
> so we sometimes end up not checking the CRC when we should.
>
> The patch on #2664 attempts to address #2, and adds some
> range checking to attempt to address #1. The patch has not
> been debugged yet, so I make no promises as to whether it
> works or not.
>
> BTW If your card uses one of these four frontends it is in
> the broken set (see carduti.cpp HasDVBCRCBug()):
>
>     return ((name == "Philips TDA10046H DVB-T") || // munges PMT
>             (name == "VLSI VES1x93 DVB-S")      || // munges PMT
>             (name == "DST DVB-S")               || // munges PAT
>             (name == "ST STV0299 DVB-S"));         // munges PAT
>   
i have an ST STV0299
> If it is not in this list you are probably experiencing #2.
> Either way, re-aiming your dish, or getting a bigger one will
> not only fix this problem but also remove dropouts, etc.
>   
i will give my dish a bit of a tweak tomorrow and see if this fixes it
--
simon