Building an ION powered Home Theatre PC with XBMC 10.0
Enabling 24fps playback
If you have a modern 1080p television which is capable of playing back material at 24 frames per second you may want to try out this experimental section. Remember these settings will only work if your display can display 1920x1080 at 24 frames per second and your source material is 24 frames per second!
Warning! These settings have only been tested with the Zotac ION-ITX-A board as found in our M350/ION-ITX-A BUNDLE.
In this section you will be editing the xorg.conf configuration file. This file controls how the NVidia chipset displays your XBMC frontend.
We recommend using a remote session via Putty to perform the following section as it will be much easier to cut & paste these settings than typing them in.
Part 1 - Method 1 (the easiest method)
Type the following commands to download our xorg.conf and restart your xbmc service.
cd /etc/X11
sudo mv xorg.conf xorg.conf.backup
sudo wget "http://www.mini-itx.com/projects/xbmc-ion/xorg.conf"
sudo service xbmc-live stop
sudo service xbmc-live start
If you are prompted for a password use the one you set up during your xbmc installation.
If your screen is now blank or otherwise unreadable you can restore your original xorg.conf using the method here
Part 1 - Method 2
How to edit your existing xorg.conf.
cd /etc/X11
sudo cp xorg.conf xorg.conf.backup
nano xorg.conf
If you are prompted for a password use the one you set up during your xbmc installation.
Your "Monitor" section should look like the following:
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
# HorizSync 28.0 - 33.0
# VertRefresh 43.0 - 72.0
Option "DPMS"
Option "ExactModeTimingsDVI" "TRUE"
HorizSync 14-70
VertRefresh 23-62
ModeLine "1920x1080@60p" 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
ModeLine "1920x1080@50p" 148.50 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
ModeLine "1920x1080@24p" 74.16 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
Modeline "1920x1080@23976" 74.23 1920 2560 2604 2752 1080 1084 1089 1125 +hsync +vsync
ModeLine "1920x1080@60i" 74.18 1920 2008 2052 2200 1080 1084 1094 1124 +hsync +vsync Interlace
ModeLine "1920x1080@50i" 74.25 1920 2448 2492 2640 1080 1084 1094 1124 +hsync +vsync Interlace
ModeLine "1920x1080@25p" 74.25 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
EndSection
Add # characters to the lines which read "HorizSync 28.0 - 33.0" & "VertRefresh 43.0 - 72.0"
Cut and paste these extra sections - they adds the exact timings needed to display the various frame-rates found in common video files.
Locate the "Screen" section, it should look as follows:
Section "Screen"
Option "FlatPanelProperties" "Scaling = Native"
Option "HWCursor" "Off"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "NoLogo" "True"
Option "DynamicTwinView" "False"
Option "TwinView" "0"
Option "FlatPanelProperties" "Scaling = Native"
SubSection "Display"
Depth 24
Modes "1920x1080@23976" "1920x1080@24p" "1920x1080@50p" "1920x1080@60p" "1920x1080@60i" "1920x1080@50i" "1920x1080@25p"
EndSubSection
EndSection
You need to add the sections:
Option "TwinView" "0"
Option "FlatPanelProperties" "Scaling = Native"
and the
Modes "1920x1080@23976" "1920x1080@24p" "1920x1080@50p" "1920x1080@60p" "1920x1080@60i" "1920x1080@50i" "1920x1080@25p"
section to the "SubSection" area.
Once you have made these changes press "CTRL-X" to quit nano, press the "Y" key to save the file and press enter to save as the same filename.
now run the following 2 commands to restart xbmc on your system:
sudo service xbmc-live start
sudo service xbmc-live stop
If your screen is now blank or otherwise unreadable you can restore your original xorg.conf using the method here
Part 2 - Change the refresh rate
You now simply need to tell XBMC to change its refresh rate to match the content you wish to playback. From the main menu select "SYSTEM", then choose "Video", then "Playback". Make sure the option "Adjust display refresh rate to match video" is checked.
In case of screen problems..
If your XBMC Live system boots to a blank screen or is otherwise unreadable you can access the command line using SSH or CTRL-ALT-F1.
Login in as normal. You should then type the following commands to restore your original xorg.conf:
cd /etc/X11
sudo cp xorg.conf.backup xorg.conf
sudo service xbmc-live stop
sudo service xbmc-live start
If you are prompted for a password use the one you set up during your xbmc installation.
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