[linux-dvb] Re: VDR fast forward problem

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Apparently I have received this message privately yesterday (which I have
responded to), but the list message arrived here only today. So I'm posting 
my private response here...

Maik Bergmann wrote:
> 
> Hm, mein Posting in der Mailingliste funktionierte irgendwie nicht.
> Ich schicke dir die Mail deswegen nochmal direkt.
> 
> Klaus Schmidinger wrote:
> 
> > Now for the tricky question: whose fault is it? The driver or VDR?
> 
> > Since the OLD system can replay both OLD and NEW recordings fine, and the
> > NEW system can replay OLD recordings fine, but NEW ones only with
> problems,
> > I would assume that there must be some difference in the file formats.
> > But then why doesn't this affect the OLD system?
> 
> I may have explanation. But i could not verify this, because i own the new
> hauppauge card and dont have a Formatdescribtion of the Videofileformat.
> 
> I think that the Index-File which would be generated by the new driver + vdr
> Versions are not poiting exactly at the beginning of an I-Frame.
> An I-Frame Pointer points a little bit befor an I-Frame. The Old driver +
> vdr can handle this problem by going itself to the beginning of the I-Frame.
> But the new driver + vdr cant do this and so the objects are not moving as
> smooth as they should be.
> 
> May you can verify this ?

I have checked this, but it would appear that the index always points to the
right position.

Example: Index 8135313 ->

 8135313 E0 video  2042 07 FA 80 80 05 23 D7 67 5D EB pts: 5651495869696  21504
 8135327 B3 sequence_header
 8135467 B5 extension_start
 8135477 B8 group_of_pictures_header - time_code: 27:17:36.10 closed_gop: 0 broken_link: 0
 8135485 00 picture_header - temporal_reference:    1  picture_coding_type: 1
 8135493 B5 extension_start
 8135502 01 slice 2B 7E 1F 63 58 34 67 A7 50 A2 1B 4C 3A B5 1B 55 B5 4F 1E CA
 8136347 02 slice 23 7E 1F 69 5A 31 67 A4 CA 14 43 68 8A 94 20 96 D4 5D 54 F2

The numbers in the index file of course always point to the beginning of a video
packet, maybe that's the offset you mean? But then again, that would have been
the same in the old version.

Maybe I'm missing something, can you elaborate your theory?

Klaus
-- 
_______________________________________________________________

Klaus Schmidinger                       Phone: +49-8635-6989-10
CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
Hofmark 2                               Email:   kls@cadsoft.de
D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
_______________________________________________________________


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