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I have a Sony Bravia V series TV.<br>
<br>
You can turn off overscan.<br>
<br>
<pre wrap="">In the TV settings, go to this menu:
Setup --< Screen Settings --< Display Area: choose "Full Pixel"
</pre>
<br>
This turns off overscan.<br>
<br>
David<br>
<pre class="moz-signature" cols="72">------------------------------------------------------------------------
Dr. David J. Knowles <a class="moz-txt-link-rfc2396E" href="mailto:dknowles@clearfield.com"><dknowles@clearfield.com></a> Senior Systems Architect
Phone (+64 9) 358 2081 Clearfield Software Ltd
Fax (+64 9) 358 2083 1st Floor 8-10 Whitaker Place
Mob (+64 21) 75 9090 P O Box 3901 Auckland, New Zealand
------------------------------------------------------------------------
</pre>
<br>
<br>
Aaron Drysdale wrote:
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<div class="Section1">
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">></span>I
get rather weird
behaviour with my TV and component out. My TV is a Sony Bravia
KLV-40V300A. <br>
<span style="color: rgb(31, 73, 125);">></span><br>
<span style="color: rgb(31, 73, 125);">></span>The TV seems to
know the difference
between a PC and a more typical component like a DVD player.<br>
<span style="color: rgb(31, 73, 125);">></span><br>
<span style="color: rgb(31, 73, 125);">></span>When I connect
using VGA or DVI/HDMI it
switches into PC mode. In this mode everything looks the way you'd
expect if
you pluged <span style="color: rgb(31, 73, 125);">></span>into a
standard LCD
monitor. A good chunk of the TV menu options are disabled (Colour,
Hue,
Sharpness, etc...)<br>
<span style="color: rgb(31, 73, 125);">></span><br>
<span style="color: rgb(31, 73, 125);">></span>When I connect
using Component (or
sometimes via DVI/HDMI if I've been messing with nvidia-settings) it
seems to
switch to a standard <span style="color: rgb(31, 73, 125);">></span>mode,
typically
720p, and in this mode the colours are dark and look terrible. Overscan
is
enabled clipping the edges from the picture.<br>
<span style="color: rgb(31, 73, 125);">></span><br>
<span style="color: rgb(31, 73, 125);">></span>I can only guess
that a DVD player has a
different colour profile from a PC and the TV is trying to compensate.
I
suspect if I messed with <span style="color: rgb(31, 73, 125);">></span>the
colour
setting within nvidia-settings I could make it look right, but that
sounds a
great deal like hard work.<br>
<span style="color: rgb(31, 73, 125);">></span><br>
<span style="color: rgb(31, 73, 125);">></span>I did the above
testing when I got the
TV, so pre-VDPAU, probably around ~173.<br>
<span style="color: rgb(31, 73, 125);">></span><br>
<span style="color: rgb(31, 73, 125);">></span>Does anyone know if
there is a flag I
can pass to the video driver to make it look right in this mode?<br>
<span style="color: rgb(31, 73, 125);">></span>Does anyone else
see similar issues with
different brands/models of TV?<br>
<span style="color: rgb(31, 73, 125);">></span><br>
<span style="color: rgb(31, 73, 125);">></span>None of the above
really worries me as I
don't use the component out, but I'm still curious.<br>
<span style="color: rgb(31, 73, 125);">></span><br>
<span style="color: rgb(31, 73, 125);">></span>Dylan<br>
<br>
<span style="color: rgb(31, 73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I
have done a LOT of reading and playing around with my system
over the weekend, and I believe that I now understand fully what is
going on,
and also why you’re seeing the behavior you’ve described. Perhaps well
known by
others, but hopefully educational for a few. BTW, I’ve also got the
KLV-40V300A
TV. When I look back, I see a few people and given me the solutions
early on, I
just didn’t recognize them for what they were!<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">When
I first created this thread, I was having 2 problems – judder,
particularly evident when watching ticker tapes on news programs, and
tearing during
playback. I’ve now solved both of these, but have had to make a
compromise along
the way.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">First,
this TV supports 1360x768 native resolution, at 60 Hz. At
this resolution, I get 1:1 pixel mapping, and absolutely perfect
desktop and
GUI with no overscan.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">The
judder is caused by a mismatch between the broadcast refresh
rate (25 fps defined by PAL) and the screen refresh rate of 60 Hz. The
resulting
3:2 pulldown creates telecine judder. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><a
moz-do-not-send="true"
href="http://en.wikipedia.org/wiki/Telecine#Telecine_judder">http://en.wikipedia.org/wiki/Telecine#Telecine_judder</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">The
solution to this is to run the screen at 50Hz – no 3:2
pulldown, and hence no judder. However, 1360x768 is a VESA format and
VESA
doesn’t support refresh rates below 60Hz. I confirmed this by looking
at the
EDID of this TV, and at least according to that 1360x768 50 Hz is not a
supported refresh rate. To get 50Hz refresh rate, I need to run at
1280x720 (ie
720p). However (and here’s the compromise) if I do that the TV has the
smarts
to think I’m now connecting a broadcast device (STB, DVD Player, etc)
and turns
on overscan and “16-235” studio levels. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Overscan
is a common “feature” of most TVs. (<a moz-do-not-send="true"
href="http://en.wikipedia.org/wiki/Overscan">http://en.wikipedia.org/wiki/Overscan</a>)
High end, and newer DFPs, often have a feature in their menus to turn
overscan
off. The Sony Bravia V Series does not.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Colours
don’t look natural. Broadcast video uses colour levels
in the range 16 – 235, while PCs use a colour range 0 – 255. So my
graphics
card is sending out video as 0 – 255, however the TV has now switched
itself to
“broadcast” mode and is interpreting the colours in the range 16-255.
Which
means, the colours at the top and bottom end of the range are all
collapsed
together. Darks and lights have lost a lot of definition and contrast.
Again,
high end TVs often have the ability to allow the user to switch colour
modes –
the Sony Bravia V Series does not. (Although I did find that going into
the TV
menu Picture > Advanced Settings > Colour Mode and changing to
Wide did
help a lot.) The only way (I think) to fix this properly is to get the
video
driver to scale the colour levels on output. This is something the
Windows
nVidia driver allows you to do, and I found this post which suggests
the Linux
driver developers will also support this in future.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><a
moz-do-not-send="true"
href="http://www.nvnews.net/vbulletin/showthread.php?t=130240">http://www.nvnews.net/vbulletin/showthread.php?t=130240</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Of
course, at 720p I also lose the 1:1 pixel mapping, and the TV
scales the resolution up to its native resolution. Which means that the
desktop
and GUI don’t look as good, although I think video playback looks
better.
Perhaps the TV’s hardware scaling is better than software scaling?</span><br>
<br>
<span style="color: rgb(31, 73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">So
all up, where am I now? I’m using HDMI 720p @ 50Hz, and get
overscan in the desktop, but the Mythtv GUI and video playback look
great after
setting the appropriate scaling and X/Y Offsets in the Mythtv Frontend
settings
menu. Since this is a dedicated Media PC, I’m going to stick with this.
Colours
look slightly unnatural (although improved after playing with the TV
brightness
and colours) but most importantly the playback is very smooth. I’m
waiting for
nVidia to provide a solution to the colours problem. Also, XBMC which I
also
use supports switching refresh rates, so when playing back NTSC source
videos
it automatically switches to 60Hz and I get smooth video there too.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I
also eventually fixed the tearing problem. Disabled composite
according to JYA’s VDPAU FAQ. Interestingly it fixes the problem even
when I
don’t have VDPAU enabled.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Of
course, now I know that ultimately the best solution would be
a new TV, but you can imagine how that went down with the wife!
Ideally, I need
a TV that supports 1920x1080 full HD with 1:1 pixel mapping; at 24Hz,
50Hz and
60Hz refresh rates; the ability to switch on/off overscan; and switch
between PC
Levels and Broadcast Levels.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I
hope all this helps someone.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Aaron<o:p></o:p></span></p>
</div>
<pre wrap="">
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