[mythtv-users] Re: Mythtv playback quality poll

[resoli at tiscali.it]

>-- Messaggio Originale --
>Date: Thu, 17 Jun 2004 06:17:28 -0700 (PDT)
>From: Chris Vargas <ceenvee at yahoo.com>
>To: mythtv-users at mythtv.org
>Subject: [mythtv-users] Re: Mythtv playback quality poll
>Reply-To: Discussion about mythtv <mythtv-users at mythtv.org>
>
>
>--- garry at sneakyninja wrote:
>> >Is someoune achieving a mythtv playback 
>> >substantially not distinguishable 
>> >from standard tv broadcast with hardware 
>> >similar to mine? 
>> 
>> I run a pvr-250 with the same settings as yours, 
>> although on a Pundit running both back and 
>> frontend. I am having the same issues, with live 
>> TV not being as fluid as 'normal' TV. 
>
>One thing to keep in mind is the issue of interlacing.
>'Normal' TV is interlaced, and the MPEG2 recordings
>that the PVR-250/350 makes are interlaced.
>
>Unfortunately, many (most?) video cards' TV outs do
>not preserve or pass-through the interlacing... that,
>and/or the drivers that are currently available don't
>preserve the interlacing. (I believe that the nVidia
>drivers for Linux don't currently support it, for
>instance.)
>
>Unless the interlacing is preserved, things like
>sports and live video will not look 'normal.'
>
>Deinterlacing is fine for computer monitor playback
>and for progressive-scan TVs, but for everything else,
>it will affect the overall look and make everything
>seem film-like (even if it's supposed to be live video).
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I'm aware of interlacing issues, but this does not explain bad quality
on standard vga output!
I think that, from a quality point of view, mpeg2 palyback at 720x576 should
be
hard to distinguish ,on a standard pc monitor, from original tv broadcast.

My tv has a scart RGB input, and i planned to build a converter from vga
to scart-rgb
(it's a simple circuit, you can find many of them on the internet). 
Unfortunately, to use the coverter you have to set X modeline exactly to
match PAL (or NTSC) signal specification. This requires to put a dot clock
  (about 14Mhz ) lower than the minimum supported by the Epia graphic chipset.
Correct me if I am wrong.

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