[linux-dvb] Re: Error behaviour: not sync'ed

[Matthias Weingart <matthias@pentax.boerde.de>]

On Wed, Aug 15, 2001 at 11:55:11PM +0200, Martin Hoffmann wrote:
> The idea is good ! But I am afraid that switching the recording from one
> card to another breaks the stream somehow - so the result would be file with
> some kind of frame error in it !?
> 
> If this card change really can be made seamlessly (is this the right word
> ?), so that the recording gets no glitches there, it would be best !

> > Secondary Card      XXXXXXXXXXXXXXXXX
> > Primary Card                        YYYYYYYYYYYYYYYY
> >
> >
> > Secondary Card      XXXXXXXXXXXXXXXXXYYYYYYYYYYYYYYY
> > Primary Card                        Y
> >

Theoretically this should be possible:
- start recording of Y at the second card before stopping it at
  the primary: 
   2th XXXXYYYYYYYY
   1st   YYYY
- after this you have the same frames in both streams for some
  seconds 
- with post processing (like cutting) you can remove the frames that are
  duplicated (use the PTS to determine what packets ar duplicated)
Btw. this feature was already discussed here some month ago.

        Matthias


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