[mythtv-users] Re: pvr-150 image looks "soft"

Paul Andreassen paulx at andreassen.com.au
Fri Dec 9 11:48:12 EST 2005


On Sat, 10 Dec 2005 01:49 am, Steve Adeff wrote:
> On Friday 09 December 2005 00:27, Paul Andreassen wrote:
> > On Fri, 9 Dec 2005 01:31 am, Steve Adeff wrote:
> > > On Thursday 08 December 2005 10:03, Steve Adeff wrote:
> > > > On Thursday 08 December 2005 01:26, Paul Andreassen wrote:
> > > > > On Thu, 8 Dec 2005 11:58 am, Mike Frisch wrote:
> > > > > > On 7-Dec-05, at 7:13 PM, Steve Hodge wrote:
> > > > > > > On 12/8/05, Steve Adeff <adeffs at gmail.com> wrote:
> > > > > > >> like a smoothing filter is being used. it looks just a tad
> > > > > > >> softer than the
> > > > > > >> source. I also notice that during scenes with movement it
> > > > > > >> looks as though the
> > > > > > >> frame rate was dropping by 5-10.
> > > > > > >>
> > > > > > >> so are there any "secret" settings I can look for or anything?
> > > > > > >
> > > > > > > A friend of mine had some success using the nvidia-settings
> > > > > > > sharpness adjustment. So if you've got a nVidia card that might
> > > > > > > be worth a try.
> > > > > >
> > > > > > What if I'm using an ATI card?  :)
> > > > > >
> > > > > > I also mentioned the softness of the picture with the PVR-250.  I
> > > > > > turned off the DNR which seems to have made a noticeable
> > > > > > improvement in picture quality but did nothing for the sharpness.
> > > > > > There are some MPEG-2 tuning parameters left but I am unsure what
> > > > > > they do.
> > > > > >
> > > > > > Mike.
> > > > >
> > > > > Have you tried increasing the bitrate?  Go nuts and see if it makes
> > > > > a difference.  I use 6400/8000 which is much better than the analog
> > > > > signal out of a digital satellite set top box.
> > > > >
> > > > > Use 720x576 and Stream Type: 'DVD-Special 2' in case you ever what
> > > > > to put it on a dvd.
> > > > >
> > > > > On every boot do a 'ivtvctl -c dnr_temporal=0' to turn off temporal
> > > > > filtering.
> > > > >
> > > > > One other thing I did was turn up the contrast and colour by 5%.
> > > > > While using Live TV on the PVR-x50, press 'g' for the recording
> > > > > controls.
> > > > >
> > > > > Paul
> > > >
> > > > well, I've got my bitrate at 6000000/8000000 already. I'm using
> > > > stream type DVD-Special 2 already. I used the temporal setting from
> > > > the previous person that posted it.
> > > >
> > > > BUT your comment about contrast and colour got me thinking. so I
> > > > searched google and found:
> > > > http://ivtvdriver.org/index.php/Ivtvctl
> > > >
> > > > which is nice for us to have.
> > > >
> > > > then I noticed the brightness was all the way up. well, every
> > > > stereophile knows the first thing you do when you go tv shopping at a
> > > > store is go into the menu and turn the brightness and contrast down
> > > > on the display TV's. Stores always turn them all the way up to make
> > > > the TV look brighter, and in the eyes of those that don't know,
> > > > "better". What it actually does is destroy the image quality. the
> > > > picture will get blury amongst other things. so changing the
> > > > brightness down to 63 seems to have fixed the softness problem I had.
> > > > Its not perfect, but now I can play with it.
> > > >
> > > > I do like being able to see the image all of a sudden shift
> > > > brightness when I do this though, kinda cool.
> > > >
> > > > anyway. I'm gunna play around with the settings ivtvctl allows to
> > > > change. I'll post my results for others to compare/argue with.
> > >
> > > ok, everytime I change the channel the brightness/contrast settings
> > > reset. how do I store the settings in MythTV so they don't change?
> >
> > These setting are stored in the database for each channel.  You have to
> > set them individually with 'g' or update the database.  Mythweb has a
> > page with channel configuration which you could use .
> >
> > Paul
>
> cool, and I assume when you make the per channel changes with 'G' they get
> saved to the database for future use?

Yes.

> Will it affect only the channel on that specific tuner?

By looking at the database, it seems that settings are for each sourceid and 
channel.

Paul
-- 


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