Ok, I've done the following:

chmod a+s for /usr/bin/mythfrontend:

[EMAIL PROTECTED] mythlogs]# ll /usr/bin/mythfrontend
-rwsr-sr-x  1 root root 955532 Mar  5 02:08 /usr/bin/mythfrontend

chmod a+w for /dev/rtc:

[EMAIL PROTECTED] mythlogs]# ll /dev/rt*
crw-rw-rw-  1 root root 10, 135 Mar 17 13:56 /dev/rtc

I've attached my mythfrontend.log (with -v playback).  In the log, I
started up mythfrontend, watched prerecorded 1080i for a few seconds
(choppy video) and then watched prerecorded 720p (choppy as well).

>From a previous comment from Jarod, I'm still getting this message
when I try to watch 1080i:

Using XvMC version: 1.0
2005-03-19 08:45:58.769 XvMCSurfaceTypes::find(w 1920, h 1, c 0, i 2,
m 0,sw 0, sh 139, disp, p<= 139, 10880 <=p, port, surfNum)

and this when trying to watch 720p:

Using XvMC version: 1.0
2005-03-19 08:46:14.357 XvMCSurfaceTypes::find(w 1280, h 1, c 0, i 2,
m 0,sw 0, sh 139, disp, p<= 139, 7200 <=p, port, surfNum)

If the "h 1" is a problem, is there a way to fix this?  Jarod mentioned 

>Something looks goofy there... w 1920 is correct, but I don't think h 1 is
>right (should be 1080)... Have you possibly made changes to the video output
>size, done something with xrandr, etc, and accidentally set the horizontal
>size to 1?

I have not changed anything on the video output size (does that mean
my xorg.conf; if so, I've attached it).  I also haven't done anything
with xrandr (don't know what that is) nor fiddled with any of the
mythtv settings around screen size, overscan, etc.

Thanks,
phlepper

-- 
I hear and I forget. I see and I remember. I do and I understand.  --  Confucius

Attachment: mythfrontend.log
Description: Binary data

# Xorg configuration created by system-config-display

Section "ServerLayout"
        Identifier     "single head configuration"
        Screen      0  "Screen0" 0 0
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"

# RgbPath is the location of the RGB database.  Note, this is the name of the 
# file minus the extension (like ".txt" or ".db").  There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
        RgbPath      "/usr/X11R6/lib/X11/rgb"
        ModulePath   "/usr/X11R6/lib/modules/extensions/nvidia"
        ModulePath   "/usr/X11R6/lib/modules/extensions"
        ModulePath   "/usr/X11R6/lib/modules"
        FontPath     "unix/:7100"
EndSection

Section "Module"
        Load  "dbe"
        Load  "extmod"
        Load  "fbdevhw"
        Load  "glx"
        Load  "record"
        Load  "freetype"
        Load  "type1"
        Load  "v4l"
        Load  "dri"
EndSection

Section "InputDevice"

# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
#       Option  "Xleds"         "1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
#       Option  "XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults).  For example, for a non-U.S.
# keyboard, you will probably want to use:
#       Option  "XkbModel"      "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
#       Option  "XkbModel"      "microsoft"
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
#       Option  "XkbLayout"     "de"
# or:
#       Option  "XkbLayout"     "de"
#       Option  "XkbVariant"    "nodeadkeys"
#
# If you'd like to switch the positions of your capslock and
# control keys, use:
#       Option  "XkbOptions"    "ctrl:swapcaps"
# Or if you just want both to be control, use:
#       Option  "XkbOptions"    "ctrl:nocaps"
#
        Identifier  "Keyboard0"
        Driver      "kbd"
        Option      "XkbModel" "pc105"
        Option      "XkbLayout" "us"
EndSection

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "IMPS/2"
        Option      "Device" "/dev/input/mice"
        Option      "ZAxisMapping" "4 5"
        Option      "Emulate3Buttons" "yes"
EndSection

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "Sony KL-W7000"
        HorizSync    30.0 - 50.0
        VertRefresh  50.0 - 85.0
#       Modeline     "1376x768" 86.00 1376 1416 1456 1720 768 770 773 808  # 86 
MHz, 50.0 kHz, 61.9 Hz
        ModeLine     "640x400" 40.0 640 656 696 800 400 402 404 421
        ModeLine     "640x480" 40.0 640 656 696 800 480 482 485 505
        ModeLine     "800x600" 50.0 800 824 864 1000 600 602 605 632
        ModeLine     "1024x768" 64.0 1024 1056 1096 1280 768 770 774 808
        ModeLine     "864x480" 54.0 864 888 928 1080 480 482 485 505
        ModeLine     "1072x600" 66.8 1072 1100 1140 1384 600 602 605 620
        ModeLine     "1376x768" 86.0 1376 1380 1420 1752 768 818 822 852
        Option      "dpms"
#       DisplaySize 1075 600
        DisplaySize 344 192
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "nvidia"
        VendorName  "XFX"
        BoardName   "nVidia GeForce4 Ti 4200"
        Option      "RenderAccel" "1"
        Option      "NvAGP" "3"
        Option      "TVStandard" "NTSC-M"
        Option      "TVOutFormat" "SVIDEO"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
#               Modes    "864x480"
                Modes    "1376x768"
#               Modes    "640x400" "640x480" "800x600" "1024x768" "864x480" 
"1072x600" "1376x768"
        EndSubSection
EndSection

Section "DRI"
        Group        0
        Mode         0666
EndSection

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