[vdr] Re: what causes cTS2PES errors?

[Rene Bartsch <ml@bartschnet.de>]

Am Mon, 2003-05-26 um 17.26 schrieb Klaus Schmidinger:
> Rene Bartsch wrote:
> > 
> > Am Son, 2003-05-25 um 18.55 schrieb Gregor Lawatscheck:
> > 
> > >
> > > It might have to do with the fact the budget cards give a "raw" TS stream
> > > whereas the full featured cards give a filtered one that might already have
> > > eliminated reception errors?.
> > 
> > The full-featured cards demux/remux the stream with their ARM using
> > CRC-code.
> > 
> > @Klaus Schmidinger: Does VDR check the TS with CRC-code?
> 
> No.
> 

That explains a lot of problems with invalid MPEG-streams (and why
MPlayer swallows with VDR-recordings).

Because of aerial circumstances (rain, snow, clouds, electricity,
overlieing waves of other transmitters, ...) you NEVER receive 100% of a
transmission (even harddisks use CRC for checking the data coming from
the IDE-interface or read from disk for bit-errors - on a 45 cm
copper-line or on 5 cm wire in the disk ...).

CRCs are a basic need for digital, aerial transmissions to keep the
bitstream valid. All streams will be corrupt without CRC (full-featured
cards do CRC-checking when filtering).

So this should be added as fast as possible (before 1.2.0 to have a
really stable system). This also would increase reception in case of bad
weather.

Rene



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