[vdr] [PATCH] time warp

Rainer Zocholl UseNet-Posting-Nospam-74308- at zocki.toppoint.de
Wed Jun 22 23:54:00 CEST 2005


s.huelswitt at gmx.de(Stefan Huelswitt)  22.06.05 15:11


>On 22 Jun 2005 Rainer Zocholl <UseNet-Posting-Nospam-74308- at zocki.topp
>>>Klaus Schmidinger wrote:
>>>> Isn't all that data protected by CRC32 checksums?
>>>> How could "garbage" get in there?
>>>> Maybe somebody should try to find out why that "garbage"
>>>> is produced in the first place...
>>
>>>I've seen this - though at least one year ago - with bad reception
>>>due to bad weather. For half an hour, the system time was jumping
>>>back and forward like crazy, starting and stopping some timers.
>>>Luckily, all timers were repeating, so none of them was gone after
>>>reception was back.
>>
>> So: Who is doing the CRC checks?

>If CRC checking is enabled on dmx-filter setup
>(dmx_sct_filter_params.flags |= DMX_CKECK_CRC), 
>the driver does it for you.

And what happens with the data if it fails?
Is it decarded or just "tagged" to be invalid?


>VDR doesn't enables the check.

Ah, that explains easily the "garbage" in "time", or?
Does that explain the "unknown picture type" problem too?

>This would be difficult, 
>as not all tables are CRC protected.

VDR knows which tables are CRC protected, or not?


Rainer




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