[mythtv-users] Stuttery / jerky DVD playback

M.austin Thornburg austin at austinandregan.com
Mon Jun 11 18:20:45 UTC 2007


I just joined this list today, so I'm not sure if the question has been
answered before. I have had the same difficulty on occasion. I have found
that it usually happens when the machine is working hard (recording 2 shows
at once while playing dvd), the machine is hot, or the machine is full. I
usually get a poppup in the background from xine that says something about
too much frameloss (which is what the jerkyness is).

My machine runs only 256 Mb RAM, so I expect issues like this (I just
upgraded to a gig this weekend -- w00t!). I would suggest upgrading the RAM,
make sure the box is running cool, not overloaded, and with a good amount of
room on the hard drive. If that doesn't do it for you, perhaps someone with
more experience can chime in. 

M.austin

-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Michelle Dupuis
Sent: Monday, June 11, 2007 12:49 PM
To: 'Discussion about mythtv'
Subject: [mythtv-users] Stuttery / jerky DVD playback

I'm running Myth .20 fixes - all functions seem to operate.  I've have a
problem when I playback a DVD, the video (in MythTV) is jerky / stuttery.

I've had this problem since I started with Myth 3 weeks ago.  I've played
with every conceivable setting to no avail.
 
I have an ATI X1600 running on Linux 2.6.18 FC6, with ATI's latest drivers
8.37.6.  There are no errors in the xorg.0.log file, and ATI's fglrx drivers
are reported in fglrxinfo (for regular graphics and OpenGL too). Overall
graphics look good (and glxgears looks good).

I'm stuck...I just can't figure this out.  Ideas anyone?  Is it:

1.  ATI driver bug (seems unlikely)
2.  Myth misconfiguration
3.  X misconfiguration (see my xorg.conf below)

HELP!!

Thanks,
MD

Section "ServerLayout"
        Identifier     "Multihead layout"
        Screen      0  "aticonfig-Screen[0]" 0 0
        InputDevice    "Keyboard0" "CoreKeyboard"
        InputDevice    "TKPANEL" "SendCoreEvents"
EndSection

Section "Files"
        ModulePath   "/usr/lib/xorg/modules"
EndSection

Section "Module"
        Load        "dbe" # Double buffering
        Load        "vnc"
        Load        "extmod"
        Load        "glx"
        Load        "dri"
EndSection

Section "DRI"
        Group 0
        Mode 0666
EndSection

# ATI does not support composite, so disable Section "Extensions"
        Option "Composite" "disable"
EndSection

Section "ServerFlags"
        # Next line is to prevent error AIGLX error: dlsym for
__driCreateNewScreen_20050727 failed
        Option "AIGLX" "off"
EndSection 

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
        Option      "XkbModel" "pc105"
        Option      "XkbLayout" "us"
EndSection

Section "Monitor"
        Identifier   "aticonfig-Monitor[0]"
        Option      "VendorName" "Sony"
        Option      "ModelName" "VPL-HS51"
        Option      "DPMS" "true"
        Modeline    "1280x720_75"   74.48  1280 1336 1472 1664  720 721 724
746 +hsync
        Modeline    "1280x720_60"   60.46  1280 1328 1456 1632  720 721 724
741 +hsync
EndSection

Section "Monitor"
        Identifier   "aticonfig-Monitor[1]"
        Option      "VendorName" "SilverstoneTek"
        Option      "ModelName" "Internal Monitor"
        Option      "DPMS" "true"
        Modeline    "1280x720_75"   74.48  1280 1336 1472 1664  720 721 724
746 +hsync
        Modeline    "1280x720_60"   60.46  1280 1328 1456 1632  720 721 724
741 +hsync
EndSection

Section "Device"
        Identifier  "aticonfig-Device[0]"
        Driver      "fglrx"
        BusID       "PCI:6:0:0"
        Screen      0
        Option      "DesktopSetup" "clone"
        Option      "UseInternalAGPGART" "no"
        Option      "KernelModuleParm" "agplock=0"
EndSection

Section "Device"
        Identifier  "aticonfig-Device[1]"
        Driver      "fglrx"
        BusID       "PCI:6:0:1"
        Screen      1
        Option      "VideoOverlay" "on"
        Option      "OpenGLOverlay" "off"
        Option      "DesktopSetup" "clone"
        Option      "UseInternalAGPGART" "no"
        Option      "KernelModuleParm" "agplock=0"
EndSection

Section "Screen"
        Identifier "aticonfig-Screen[0]"
        Device     "aticonfig-Device[0]"
        Monitor    "aticonfig-Monitor[0]"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes     "1280x720_75" "1280x720_60"
        EndSubSection
        Option     "PasswordFile"     "/home/mythtv/.vnc/passwd"
EndSection

Section "Screen"
        Identifier "aticonfig-Screen[1]"
        Device     "aticonfig-Device[1]"
        Monitor    "aticonfig-Monitor[1]"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes     "1280x720_75" "1280x720_60"
        EndSubSection
        Option     "PasswordFile"     "/home/mythtv/.vnc/passwd"
EndSection

## TouchKit section begin (Please do NOT edit this section!!) ##
        Section "InputDevice"
                Identifier  "TKPANEL"
                Driver      "touchkit"
                Option      "Device"        "/dev/tkdat0"
                Option      "DebugLevel"    "0"
        EndSection
## TouchKit section end ##

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