On Monday 05 June 2006 23:23, Steven Ellis wrote:
> Hans Verkuil wrote:
> >On Monday 05 June 2006 13:29, Steven Ellis wrote:
> >>Hans Verkuil wrote:
> >>>On Monday 05 June 2006 03:40, Steven Ellis wrote:
> >>>>Is there any support for de-ghosting signals within the IVTV
> >>>>tuners? A number of the tv stations in NZ include the extra
> >>>>information to help de-ghost a signal which would improve
> >>>>reception on a couple of channels quite considerably.
> >>>
> >>>That's probably for widescreen transmissions I guess? Anyway, to
> >>> my knowledge there is no support for that. And I don't think it
> >>> is possible to add it. I don't believe either the saa7115 or the
> >>> cx2584x support something like that.
> >>
> >>Actually the carrier is part of some standard 4:3 PAL signals here
> >> in NZ. Due to geographic issues (NZ has an abundance of geography)
> >> severe ghosting is common. You can get units that will de-ghost a
> >> single channel, but then you need to feed the composite input into
> >> your MythTV box which is a pain. If the IVTV cards understood the
> >> signal they could handle it automatically. Didn't know if there
> >> were any undocumented additions to the denoise filters.
> >
> >Do you have a pointer to some description of the signal? I only know
> >about the PALplus standard for widescreen transmissions where the
> > black bars above and below the picture contain extra information.
> >
> >Could it be that it isn't extra information but special deghosting
> >hardware? I know that several Japanese MPEG cards have special chips
> >that do this (those are supported by ivtv).
>
> There is a reference at
> http://portal.etsi.org/radio/AnalogueTVBroadcasting/ATVB.asp if you
> search on GCR.
I've looked at it. Interesting, but alas, it isn't supported.
> Don't know the details. I just have some customers with IVTV cards
> and really badly ghosted signals that i'm trying to help
Experiment with the dnr_* codec parameters (see doc/fw-encoder-api.txt
for precise information on these parameters). Especially the temporal
settings can have an effect on ghosting.
Hans
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