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<p class=MsoNormal>I have searched for and read every thread I could find on
bob deinterlacing but I am still experiencing significant shaking or jitter
when using bob x2 with sd and hd recordings (NTSC). Originally I was
using a modeline I found in the mythtv wiki for my tv and the refresh rate came
out to just under 60 so myth wouldn’t use bob x2. In my reading I had
come across threads where people suggested using xvidtune to adjust the
modeline so that the refresh rate was just over 60.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Modeline from wiki “1368x768@85”
85.50 1368 1414 1526 1798 768 771 777 795 +hsync –vsync<o:p></o:p></p>
<p class=MsoNormal>Modeline tweaked “1368x768@85”
85.50 1368 1400 1720 1792 768 783 791 795 +hsync –vsync<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Xvidtune wouldn’t let me adjust on the fly so I used a
modeline calculator <a href="http://xtiming.sourceforge.net/cgi-bin/xtiming.pl">http://xtimingsourceforge.net/cgi-bin/xtiming.pl</a>
and put in my tv’s specs and made adjustments until the refresh rate was
over 60. after a reboot with my tweaked modeline in xorg.conf, xvid
showed the following.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Pixel Clock: 85.50 MHz<o:p></o:p></p>
<p class=MsoNormal>Horizontal Sync: 47.71 kHz<o:p></o:p></p>
<p class=MsoNormal>Vertical Sync: 60.02 Hz<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>My tv is a Vizio 50” Plasma that I got from Costco
about almost 2 years ago. The specs from the manual are as follows.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Resolution Refresh
(Hz) H.Freq (kHz) V.Freq
(Hz) H.Sync V.Sync Pixel
Freq (MHz)<o:p></o:p></p>
<p class=MsoNormal>1366x768 60
47.7
60.00
P
N 85.500<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>At this point, myth let me use bob x2 but like another user
reported here <a
href="http://www.gossamer-threads.com/lists/mythtv/users/310039?do=post_view_threaded#310039">http://www.gossamer-threads.com/lists/mythtv/users/310039?do=post_view_threaded#310039</a>,
it looked like there was an earthquake going on, moreso for sd than hd
recordings. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am running mythtv version 0.21 compiled from source on
Ubuntu 7.10 Gutsy with an onboard Nvidia GeForce 6150 gpu using nvidia driver
version 169.12, 1gb of ram, 2gb of swap, and an Amd Athlon 64 X2 Dual
Core 4200+ processor. The plasma tv is connected to the computer via vga.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Nvidia settings<o:p></o:p></p>
<p class=MsoNormal>0/OpenGLImageSettings=1<o:p></o:p></p>
<p class=MsoNormal>0/XVideoTextureSyncToVBlank=1<o:p></o:p></p>
<p class=MsoNormal>0/XVideoBlitterSyncToVBlank=1<o:p></o:p></p>
<p class=MsoNormal>0/XVideoSyncToDisplay=1<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>In mythfrontend, I have “enable OpenGL vertical sync
for timing” checked. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have a total of 3 combined frontend backend machines and I
tried getting bob x2 to work on the other two as well with the same shaky
results.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> Monitor GPU Nvidia
Driver Processor<o:p></o:p></p>
<p class=MsoNormal>Setup 1 50”P50HDTV
Vizio Plasma TV onboard nvidia 6150 169.12 AMD
Athlon 64 X2 Dual Core 4200+ 2.2ghz<o:p></o:p></p>
<p class=MsoNormal>Setup 2 42”GV42L
Vizio LCD TV onboard
nvidia 6150 1.0.9639 AMD
Athlon 64 X2 Dual Core 3800+ 2.0ghz<o:p></o:p></p>
<p class=MsoNormal>Setup 3 19”Samsung
920NW LCD nvidia
geforce 7300LE 100.14.19 Intel
Core 2 Duo 6420 2.13ghz<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>On all 3 machines I had to adjust the modelines to get the
refresh rate above 60 using the native resolutions of the screens (although 1368x768
was the closest I could get to 1366x768 for the 2 vizio’s). <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’ve read that there is some jitter to be expected
with bob x2 enabled but what I am seeing is unwatchable for sd recordings.
It’s better on hd recordings but it gives you a headache after a while.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I would really like to get bob working correctly but I am
fairly new to all of this deinterlacing and refresh rate stuff. I feel
that I have done as much as I can on my own and at this point I don’t
know what else to do so I’m turning to the community for help. If
anyone can offer any suggestions it would be greatly appreciated.<o:p></o:p></p>
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