[mythtv-users] What's easier to convert/decode? 720p or 1080i?

[john roberts]

Something I know about! ;)

I have the Samsung DLP - and here is what I found.

The DVI interface will only do 1280x720p - it will NOT do 1920x1080i.  Because of this I moved to using the VGA interface which WILL do 1920x1080i.

Why?  Because - as you said - the TV did a much better job of de-interlacing the 1080i content.  But - you do lose signal quality when using the VGA (analog) connection.

I've recently moved back to the DVI cable - cuz I just can't give up on a pure digital connection. :(  I'm still working out if Bob/other de-interlace methods have gotten any better.

And yes - XRANDR is used to change the mode in which the video card is sending to the TV.  Make sure you have this option compiled in (settings.pro).  Once done - you will see a "new" screen under TV -> Appearance which allows you to do as you say here "If 1080i then... if 720p then..."

Have fun - let me know if you get anywhere with your DLP.  DVI is the way to go if you can get 1080i to work (or just don't care that much about the 1080i content).

-John

----- Original Message -----
From: "Joe Barnhart" <joebarnhart at yahoo.com>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Subject: Re: [mythtv-users] What's easier to convert/decode? 720p or 1080i?
Date: Mon, 14 Mar 2005 16:21:25 -0800 (PST)

> 
> 
> --- Art Morales <bioart at gmail.com> wrote:
> 
> > I have a Samsung DLP tv that displays natively at
> > 720p. Would it be better to send the signal as 1080i and
> > have the machine
> > convert 720p to 1080i?
> 
> If your set is 720p native, by all means use a 720p
> modeline.  I have a 1080i native set, and the CPU
> requirements are significantly higher for 1080i
> content than 720p content.  So the modeline isn't the
> sole reason you are seeing higher CPU usage on your
> setup.
> 
> I preduct your picture quality will suffer greatly if
> you use a 1080i modeline and have the content
> upconverted in myth and then downconverted by the set.
>   I know that 720p content looks pretty marginal at
> times on my set, and I think it is because the nvidia
> video card (and its driver) does the scaling and does
> a poor job of it.
> 
> 
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