[mythtv-users] pcHDTV card analog NTSC input

Greg Stark gsstark at mit.edu
Fri Apr 14 06:54:13 UTC 2006


"Michael T. Dean" <mtdean at thirdcontact.com> writes:

> On 04/09/2006 01:43 AM, Greg Stark wrote:
> > Greg Stark <gsstark at MIT.EDU> writes:
> >
> > But this is fascinating. The contrast setting keeps getting set back to 127
> > every time mythtv goes to record something. I don't know if this is mythtv's
> > fault or the driver's. 
> >   
> 
> Press G while in LiveTV...

This is a problem. Mythtv is storing the contrast setting associated with the
channel. But the problem isn't the channel, it's the tuner.

So if I adjust the contrast down on a particular channel I get a greyed out
image when it uses the WinTV card. If I leave it set to the normal settings I
get a blaring white high contrast image when it uses the pchdtv card.

It seems like mythtv is just not handling the ranges for this setting on these
two cards properly. On one card the range is 0-127 with a default of 64.
mythtv uses 127 which I imagine it supposes is 50% contrast. It looks fine.

On the other card the range is 0-255 with a default of 63 and mythtv sets the
contrast to 127, which again I imagine it thinks is 50% contrast. However on
this card that setting is inappropriate. The default setting of 63 looks fine
though.

So what I need is a way to adjust the picture settings on a per-capture-card
basis. Not just a per-channel basis.


PVR-350 IVTV:

attribute  | type   | current | default | comment
-----------+--------+---------+---------+-------------------------------------
bright     | int    |     127 |     128 | range is 0 => 255
contrast   | int    |     127 |      64 | range is 0 => 127
color      | int    |      63 |      64 | range is 0 => 127
hue        | int    |       0 |       0 | range is -128 => 127
volume     | int    |   58950 |   58880 | range is 0 => 65535

pchdtv-3000:

attribute  | type   | current | default | comment
-----------+--------+---------+---------+-------------------------------------
bright     | int    |     127 |       0 | range is 0 => 255
contrast   | int    |     127 |      63 | range is 0 => 255
color      | int    |     127 |     127 | range is 0 => 255
hue        | int    |     127 |       0 | range is 0 => 255
volume     | int    |      63 |      31 | range is 0 => 63


-- 
greg



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