[linux-dvb] Re: FF cards alter PTS'?

[Onno Kreuzinger <onnok@web.de>]

Urg i hate sending mail wrong, but it happened again

Holger Waechtler schrieb:
> Onno Kreuzinger wrote:
>
> > > I was mainly thinking of df-gp, the first VDR patch I know that 
> > > worked on the frambuffer (http://df-gp.sourceforge.net/). The first 
> > > NEWS entry is now about 19 months old.
> > df-gp suffers from exactly the problems i expected, 1st: only Matrox 
> > tv-out cards are suffcienty good ($$$),
>
> I doubt that is true.
Well i was looking for a gfx with a tv-out suitable for a quite big 100Hz,
and atleast accordind to the c't tests, only _very_ few gfx cards are only
~5-10% off the pal standart, matrox is and was always good at tv-out, but
$$$, if you realy doubt i will scan you the article, it only a few month old.

> > second: av-sync is not solved (19 month), 
>
> IIRC they are using the libmpeg2 DirectFB video provider, video sync is 
> simply not implemented there. As alternative you can install e.g. the 
> experimental mplayer-based video provider which is of higher quality, 
> implements correct sync and can deinterlace on request or you wait until 
> one of the DirectFB maintainers finished the ffmpeg video provider. Andi 
> is working on it.
>
> > third: de-interlace _is_ an immanent problem not solable without real 
> > de-interlacing software,
>
> ffmpeg contains a deinterlacer of pretty good quality. Give it a try.
well, i doubt it can realy handle all mpeg2 wich may come from the sky, like
the mentioned problems which arise if the tv broadcast uses all
interlaced/progressive formats allowed, if you would watch sky news regulary
you would not like to have tearing picture when pictures from mobile
DV and the banner are mixed (afaik the picture is 25ni, but the banner and
logo are 50i)

there was a very good discussion about optimal (offline) conversion
regarding the effects of de-interlacing on vdr-portal.de (german),
allthoug no new software was born, it became clear, that one can't predict
what will come from the sky, thus (for encoding) one would have to
test-encode with (at least 2) different settings and do a weighted compare
on the psnr values mencoder can output.
and the deeper one digs the more trouble (might!) come from interlacing and
de-interlacing (what if the 100hz tv's de-interlacer doesn't understand what
you did to the now de-interlaced picture, which (might) have some artefacts
left).


> Holger
Regards Onno





--
Info:
To unsubscribe send a mail to ecartis@linuxtv.org with "unsubscribe linux-dvb" as subject.