Am Mittwoch 22 Juni 2005 00:10 schrieb Rainer Zocholl:
udo_richter@gmx.de(Udo Richter) 19.06.05 16:40
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? Maybe it's turned off or only an error bit is set but nobody cares about in further processing? (Maybe the cause for "unkown picture type" too?)
It's very unlikely that garbage can so often pass a CRC32 check.
The TDT is not specified to contain a CRC32 checksum. All larger tables have this, NIT, EIT, SDT, also TOT. The "small" ones TDT and RST have no checksum.
Marcel
Rainer
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