On Tuesday 19 December 2006 20:45, Maarten Maathuis wrote:
> I don't mean default, just that it's on that (default sais 0), maybe
> i changed it a long time ago? (i always had the impression the
> settings were not remembered)
>
> On 12/19/06, Maarten Maathuis <[EMAIL PROTECTED]> wrote:
> > temporal_filter 8 seems to be default here.
> >
> > Just wanted to let you know. (using ivtv 0.9.1)
The default is 0 for the 2.6.18 and 8 for the 2.6.19 kernel. Both are
actually wrong :-( It should be 8 for full resolution capture and 0 for
scaled capture.
Hans
> >
> > Maarten.
> >
> > On 12/19/06, Trevor Bradley <[EMAIL PROTECTED]> wrote:
> > > I've just discovered the magic of the temporal filter on the
> > > Hauppauge PVR cards (see my previous post). In brief, appears to
> > > clean up a noisy analog signal to give a cleaner mpeg recording.
> > > However, I note that there appear to be several other filters.
> > > If I run "v4l2-ctl -l | grep filter" on my machine, I appear to
> > > get parameters for:
> > >
> > >
> > >
> > > spatial_filter_mode (0),
> > >
> > > spatial_filter (0)
> > >
> > > spatial_luma_filter_type (1)
> > >
> > > spatial_chroma_filter_type (1)
> > >
> > > temporal_filter_mode (0)
> > >
> > > temporal_filter (8, was 0)
> > >
> > > median_filter_type (0)
> > >
> > > median_luma_filter_minimum (0)
> > >
> > > median_luma_filter_maximum (255)
> > >
> > > median_chroma_filter_minimum (0)
> > >
> > > median_chroma_filter_maximum (255)
> > >
> > >
> > >
> > > the numbers in brackets are my current settings for these
> > > parameters.
> > >
> > >
> > >
> > > By simply changing my temporal_filter from 0 to 8, I saw a
> > > dramatic improvement in image quality. This gets me thinking
> > > that modifying these other numbers might be useful, but I've not
> > > found any documentation whatsoever on these filters, and I'm
> > > hoping someone might be able to enlighten me.
> > >
> > >
> > >
> > > Can anyone explain what the ivtv spatial, temporal, and median
> > > filter settings actually do? Are they hardware or software
> > > filters? What's the difference between the filter and the filter
> > > type? What settings are appropriate for a TV? What numbers are
> > > too high? (I noticed that a temporal filter setting of 10 caused
> > > mpeg recording errors, and a max setting of 31 generated some
> > > bizarre visual effects). Should this information be documented
> > > in the wiki?
> > >
> > >
> > >
> > > This question belongs in ivtv-users, but the people who would be
> > > able to answer the question are likely lurking in ivtv-devel.
> > > Hopefully some of the developers read both groups.
> > >
> > >
> > >
> > > Trevor Bradley
> > >
> > > Surrey, BC. Canada
> > >
> > >
> > > _______________________________________________
> > > ivtv-users mailing list
> > > [email protected]
> > > http://ivtvdriver.org/mailman/listinfo/ivtv-users
>
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