No subject
Mon Mar 10 15:32:33 UTC 2008
- With DVI-PC, EDID info from the tv will cause a perfectly working 1360x76=
8
60Hz modeline to be generated, but not a 50Hz equivilent.
- If I disable all EDID information, and manually create a 50Hz 1360x768
modeline, there is no overscan, but internally the picture is getting up an=
d
down scaled. I've tested this using pixel patterns. On top of this, the
framerate is HALVED (evidence for this in a moment).
- The DVI-DTV mode provides no useful EDID, but if I generate a 1280x720
modeline at either 50Hz or 60Hz, the display is fine (with a small amount o=
f
overscan, appropriate for a STB). Obviously there is no 1:1 pixel mapping.
Video is also silky smooth, it's just the repeated up/down scaling I think
is causing the picture to be a little blurry.
- While using the 1280x720 at 50Hz modeline, (which provides smooth playback o=
n
the DVI-DTV mode), and switching to the DVI-PC mode, I get a picture with n=
o
overscan, but with the framerate halved. Moving the mouse is like watching =
a
series of screenshots, it's definitely the TV, and not my Myth box
All this is with DVI, I'll try VGA again tonight (can't remember the result=
s
from the last test I did, and not sure if I did test everything).
So with 1280x720 at 50Hz and 60Hz, on DVI-DTV, I get acceptable playback.
1360x768 at 60Hz on DVI-PC also provides excellent quality, but only for 60Hz
video.
Does anyone know of any extra filters for sharpening the video that I can
apply, also deblocking would be nice, because the compression on some of th=
e
channels is getting terrible ?
P.S. I've been fiddling with this TV for around 2 years now, if it were up
to me I'd dump it, but the other members would complain about
money-wasting...
On 13/05/2008, Joan Vall=E9s <joan.valles at gmail.com> wrote:
>
> according to this site http://pixelmapping.wikispaces.com/LG+TVs your
> model only suppors 1:1 on HDMI at 60Hz VGA is not known but usually it
> should be fine
>
> On Tue, May 13, 2008 at 3:02 AM, Yan-Fa Li <yanfali at gmail.com> wrote:
>
> > On Mon, May 12, 2008 at 5:37 PM, Bill Williamson <bill at bbqninja.com>
> > wrote:
> > >
> > > On Tue, May 13, 2008 at 7:53 AM, James Buckley <
> > xanium4332 at googlemail.com>
> > > wrote:
> > > >
> > > > Yes I can drive it by VGA. Seems odd that VGA would be better than
> > DVI
> > > though, (as DVI is like the digital form of VGA). Does your TV do any
> > > scaling on the picture?
> > > >
> >
> >
> > It's not that odd if your TV is 720p. HDMI only has to support 480p,
> > 720p and 1080p progressive formats. VGA ports are usually capable of
> > pushing native panel resolutions. My sony TV supports 1360x768 native
> > via VGA. HDMI 720p signals are scaled up to native by the TV itself.
> > That's why I prefer to feed it 1080i as scaling usually looks better
> > than up since you're discarding information rather than interpolating.
> > I use mythtv via VGA and it looks pretty darn good.
> >
> > just my 0.02USD.
> >
> > Yan
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> >
>
>
>
> --
> Joan
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
>
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<div>OK, Well I'm actually using a DVI port of the TV (not HDMI). =
The TV has 2 input 'modes' for the DVI port (which is also the VGA =
port, just use an adapter). There's DVI-PC, and DVI-DTV.</div>
<div> </div>
<div>From here on is with DVI, I'll try VGA tonight:</div>
<div>- With DVI-PC, EDID info from the tv will cause a perfectly working 13=
60x768 60Hz modeline to be generated, but not a 50Hz equivilent.</div>
<div>- If I disable all EDID information, and manually create a 50Hz 1360x7=
68 modeline, there is no overscan, but internally the picture is getting up=
and down scaled. I've tested this using pixel patterns. On top of this=
, the framerate is HALVED (evidence for this in a moment).</div>
<div>- The DVI-DTV mode provides no useful EDID, but if I generate a 1280x7=
20 modeline at either 50Hz or 60Hz, the display is fine (with a small amoun=
t of overscan, appropriate for a STB). Obviously there is no 1:1 pixel mapp=
ing. Video is also silky smooth, it's just the repeated up/down scaling=
I think is causing the picture to be a little blurry.</div>
<div>- While using the <a href=3D"mailto:1280x720 at 50Hz">1280x720 at 50Hz</a> m=
odeline, (which provides smooth playback on the DVI-DTV mode), and switchin=
g to the DVI-PC mode, I get a picture with no overscan, but with the framer=
ate halved. Moving the mouse is like watching a series of screenshots, it&#=
39;s definitely the TV, and not my Myth box</div>
<div> </div>
<div>All this is with DVI, I'll try VGA again tonight (can't rememb=
er the results from the last test I did, and not sure if I did test everyth=
ing).</div>
<div> </div>
<div>So with <a href=3D"mailto:1280x720 at 50Hz">1280x720 at 50Hz</a> and 60=
Hz, on DVI-DTV, I get acceptable playback. <a href=3D"mailto:1360x768 at 60Hz"=
>1360x768 at 60Hz</a> on DVI-PC also provides excellent quality, but only for =
60Hz video.</div>
<div> </div>
<div>Does anyone know of any extra filters for sharpening the video that I =
can apply, also deblocking would be nice, because the compression on s=
ome of the channels is getting terrible ?<br><br>P.S. I've been fi=
ddling with this TV for around 2 years now, if it were up to me I'd dum=
p it, but the other members would complain about money-wasting...</div>
<div> </div>
<div><span class=3D"gmail_quote">On 13/05/2008, <b class=3D"gmail_sendernam=
e">Joan Vall=E9s</b> <<a href=3D"mailto:joan.valles at gmail.com">joan.vall=
es at gmail.com</a>> wrote:</span>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">according to this site <a onclic=
k=3D"return top.js.OpenExtLink(window,event,this)" href=3D"http://pixelmapp=
ing.wikispaces.com/LG+TVs" target=3D"_blank">http://pixelmapping.wikispaces=
.com/LG+TVs</a> your model only suppors 1:1 on HDMI at 60Hz VGA is not know=
n but usually it should be fine=20
<div><span class=3D"e" id=3D"q_119e1298ddc63053_1"><br><br>
<div class=3D"gmail_quote">On Tue, May 13, 2008 at 3:02 AM, Yan-Fa Li <<=
a onclick=3D"return top.js.OpenExtLink(window,event,this)" href=3D"mailto:y=
anfali at gmail.com" target=3D"_blank">yanfali at gmail.com</a>> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0pt 0=
pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<div>On Mon, May 12, 2008 at 5:37 PM, Bill Williamson <<a onclick=3D"ret=
urn top.js.OpenExtLink(window,event,this)" href=3D"mailto:bill at bbqninja.com=
" target=3D"_blank">bill at bbqninja.com</a>> wrote:<br>><br>> On Tue=
, May 13, 2008 at 7:53 AM, James Buckley <<a onclick=3D"return top.js.Op=
enExtLink(window,event,this)" href=3D"mailto:xanium4332 at googlemail.com" tar=
get=3D"_blank">xanium4332 at googlemail.com</a>><br>
> wrote:<br>> ><br>> > Yes I can drive it by VGA. Seems odd =
that VGA would be better than DVI<br>> though, (as DVI is like the digit=
al form of VGA). Does your TV do any<br>> scaling on the picture?<br>
> ><br><br> </div>It's not that odd if your TV is 720p. &nbs=
p;HDMI only has to support 480p,<br>720p and 1080p progressive formats. &nb=
sp;VGA ports are usually capable of<br>pushing native panel resolutions. &n=
bsp;My sony TV supports 1360x768 native<br>
via VGA. HDMI 720p signals are scaled up to native by the TV itself.<=
br>That's why I prefer to feed it 1080i as scaling usually looks better=
<br>than up since you're discarding information rather than interpolati=
ng.<br>
I use mythtv via VGA and it looks pretty darn good.<br><br>just my 0.=
02USD.<br><font color=3D"#888888"><br>Yan<br></font>
<div>
<div></div>
<div>_______________________________________________<br>mythtv-users mailin=
g list<br><a onclick=3D"return top.js.OpenExtLink(window,event,this)" href=
=3D"mailto:mythtv-users at mythtv.org" target=3D"_blank">mythtv-users at mythtv.o=
rg</a><br>
<a onclick=3D"return top.js.OpenExtLink(window,event,this)" href=3D"http://=
mythtv.org/cgi-bin/mailman/listinfo/mythtv-users" target=3D"_blank">http://=
mythtv.org/cgi-bin/mailman/listinfo/mythtv-users</a><br> </div></div><=
/blockquote>
</div><br><br clear=3D"all"><br></span></div>-- <br><span class=3D"sg">Joan=
</span><br>_______________________________________________<br>mythtv-users=
mailing list<br><a onclick=3D"return top.js.OpenExtLink(window,event,this)=
" href=3D"mailto:mythtv-users at mythtv.org">mythtv-users at mythtv.org</a><br>
<a onclick=3D"return top.js.OpenExtLink(window,event,this)" href=3D"http://=
mythtv.org/cgi-bin/mailman/listinfo/mythtv-users" target=3D"_blank">http://=
mythtv.org/cgi-bin/mailman/listinfo/mythtv-users</a><br><br></blockquote></=
div>
<br>
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