[mythtv-users] PCHDTV-5500 Sound and Contrast on ubuntu

Nathan Smith nsmith5 at umbc.edu
Mon Jun 26 19:10:44 UTC 2006

On Mon, 26 Jun 2006, Brad Templeton wrote:

> On Mon, Jun 26, 2006 at 10:26:28AM -0400, Nathan Smith wrote:
> > Hey Sam,
> >
> > On Mon, 26 Jun 2006, Samuel Leathers wrote:
> >
> > > I just got a PCHDTV-5500 card. Two issues I'm having. The first is the
> > > contrast is too high by default (looks great if I go in TVTime and change
> > > the contrast to 25%). How do I do this with mythtv to default to that?
> >
> > I have had to do the same thing.. along with boost the color level to
> > about 80%, and the brightness to 60%, on every channel. Also, I don't know
> > if it's more the card or the software, but I found the default sound
> > configuration to be very low quality (you could hear the compression), so
> > I am now running with uncompressed audio.
> This makes no sense.  All HDTV "capture" cards are pretty much the same,
> they just decode a raw bitstream out of the air, which is an mpeg-2/ts.

Are you sure that the internals of the 5500 are the same as other HDTV
capture cards? Even if it uses the same chipset, who's to know what other
algorithms are run on the data before it is sent to the video device.

> There are no "contrast" or "brightness" settings.

Sure there are. I'm talking about contrast and brightness settings by
pressing "g" during playback.

> It's possible you have another card which is an actual capture card
> for NTSC, and it has bad settings, so your playback settings have been
> made wrong in order to compensate?

The "PCHDTV" option in mythtv-setup does not work at all, so I was forced
to go with an analog capture card setting. That could be the problem, but
I see no other option. I'm guessing the PCHDTV option is for the 3000 and
previous cards, since the 5500 is running on a new chipset, AFAIK. Other
than the settings problems, the playback looks superb.


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