[mythtv-users] More Beginner Questions
linux.luser at myrealbox.com
Sun Jan 21 22:09:07 UTC 2007
On 21 Jan 2007, at 20:17, Greg Kettmann wrote:
> Well, I've spent many hours reading and there are still times when I
> think I get more confused instead of less...
> In a previous post I indicated I'm interested in HDTV ... the
> plus further reading, indicate that this probably isn't a great
> point. One of the major reasons for that would be the lack of an
> HDTV /
> Analog card. Since I need to buy an analog card anyway I should
> probably start there and then build up. I just want to keep in mind
> where I'd like to end up and not buy components which are not
> for the final vision. So, for example, I'll start with a system with
> enough horsepower to output/decode an HD stream.
Don't make a big deal out of this or worry too much - it shouldn't be
at all a problem to buy an analogue card now and slap in a DVB card
in a few weeks time. If no HDTV / Analog cards (I assume you mean
combined?) are available then I'd personally be inclined just to buy
two cards at the first instance - I don't know about DVB-C cards but
the DVB-T & DVB-S cards we use here in the UK are only about £40 each.
> ... It's a little disconcerting
> the direction of the cable companies, etc.
> ... All I want to do is time
> shift my favorite shows, like we've done for years since the advent of
> the VCR. Oh well.
I think - to be fair to the cable companies - that they have been
consistent, and opposed the VCR back in the day, too. The geek
community heralded Zimmerman's PGP as "cheap encryption for all" -
unfortunately it is the modern cheapness of encryption that now
allows the cable companies to achieve what they've always wanted.
> 2) TV-out - Keep in mind that I'd eventually like HD. My TV is
> of this. The Hauppauge PVR-350 does composite out but I suspect it's
> the standard RGB and I think HD requires YPbPr.
Composite out is nether RGB nor YPbPr - it is a "composite" signal of
all the colours down one wire. This is the yellow phone cable you
often see on TV-output cables - maybe the one for your iPod or
digital camera; the white & red phono plugs that accompany the yellow
plug just carry sound. Composite is not well regarded for image quality.
In RGB the colours are completely separated (well, 3 wires down one
cable) and in component (YBbPr?) the colour "components" are (pretty
much) also separated but in a different way (I think luminance is
mixed in there somewhere?).
> Is this correct?
You are correct in thinking that component (YPbPr) is the best of
these signal types.
I believe that S-Video is also a consideration, and that it, too, can
carry a decent signal. However I don't know much about this. I
believe that many TV-outs accommodate it, and I believe that some S-
video cables may carry composite.
> I believe my TV will take either. If the PVR-350 won't work then
> it looks
> like an NVidia card should be considered, however, although they list
> "composite" output I don't find any definitions of the RBG / YPbPr
> aspect. Do I have something wrong? The only writeup I've seen on HD
> output used a device (for a bit over $100) that converted a
> standard VGA
> type monitor jack into a composite/YPbPr signal. I'd prefer something
> on a card.
Do you have something wrong? Only the common mistake of confusing
composite & component. I think everyone must do this at first!!
Component output on video cards is not well advertised, but it is
available. Quite a few nVidia based cards offer it - I think nVidia
stuck it on one of their reference cards and all their OEMs have just
copied that; they all seem to use a similar convertor "dongle".
Search gossamer for "nvidia component" and you'll see my posts of 2 -
4 weeks ago; the keyword on the packaging at PC World is, I think,
"HDTV out" or "Hi-Def out", one of the two.
I have read of people using VGA to component convertor boxes but like
you, I don't think it's necessary. Audio Authority are a brand-name
to search for if you want to know more. VGA to composite convertor
boxes are readily available (and cheap) but again give shitty image
> The obvious issue is how to I connect the MythTV box to the
> television at the desired resolutions and it's still unclear how to do
I didn't find this terribly well documented - connecting with RGB or
component, I mean. Someone posted this weekend about using a homemade
VGA -> RGB cable, for instance, but you find so many disclaimers on
the net that this will (probably) only work with brand-X video cards
(I don't think one of these has ever been proven to have actually
fried a TV) that I couldn't be arsed.
My investigations indicated that there are quite a number of people
happily connecting Myth to their TVs using good quality analogue
connections - certainly, I found no evidence that anyone had failed
to do so, but I'm actually chickening out of this route, myself. Pure
laziness, really, mixed with aspirational geek consumerism - I plan
to just get a TV with digital inputs which I'll connect to using DVI,
but this is an expensive route & I think a good recommendation would
be one of the nVidia cards with component.
More information about the mythtv-users