[mythtv-users] XvMC question

[Kevin Kuphal]

On Sat, Jul 26, 2008 at 11:56 PM, <ojw at weilerfamily.com> wrote:

>
> I'm having what seems to be an XvMC problem.  Perhaps someone
> here can give me a sanity check...
>
> I'm running a P4 1.8Ghz (400Mhz FSB) with 640MB of RAM on a Dell
> Dimension 4400.  I'm using a nvidia 6200 AGP based card (specifically,
> this one:
> http://www.newegg.com/Product/Product.aspx?Item=N82E16814130233)
> I'm recording only mpeg2 streams from an ATSC tuner.  When I try
> to playback 1080i based recordings, I'm averaging in the mid 70%
> range on my cpu meter as reported by top and about every 5 seconds,
> the video stutters.  Based on what I've heard on this list, this
> sounds like this card should be able to offload some of that cpu
> and that maybe I don't have XvMC set up correctly.
>
> I'm pretty sure I followed all the instructions at
> http://www.mythtv.org/wiki/index.php/XvMC.
>
> Here are some of the things I have checked:
>
> "dmesg | grep nvidia" produces this:
>
> nvidia: module license 'NVIDIA' taints kernel.
> NVRM: loading NVIDIA UNIX x86 Kernel Module  173.14.05  Mon May 19
> 00:06:12 PDT 2008
>
> The kernel version is 2.6.25.4 compiled from sources from kernel.org.
>
> "/sbin/lspci | grep -i nvidia" produces:
>
> 01:00.0 VGA compatible controller: nVidia Corporation NV44A [GeForce
> 6200] (rev a1)
>
> "/sbin/lsmod | grep -i nvidia" produces:
>
> nvidia               7091236  36
> i2c_core               20756  12
>
> lgdt330x,qt1010,mt2060,mt352,zl10353,xc3028_tuner,tvp5150,tuner,nvidia,em28xx,i2c_i801,tveeprom
>
> The video card section of my xorg.conf looks like this:
>
> Section "Device"
>     Identifier     "Videocard0"
>     Driver         "nvidia"
>     Option         "UseEvents" "true"
>     Option         "XvmcUsesTextures" "false"
>     Option         "NVAGP" "1"
> EndSection
>
> When I do this "grep Motion /var/log/Xorg.0.log", I get this:
>
> (II) Loading extension XVideo-MotionCompensation
>
> Running "mythfrontend --version" produces this:
>
> Please include all output in bug reports.
> MythTV Version   : exported
> MythTV Branch    : tags/release-0-21
> Library API      : 0.21.20080304-1
> Network Protocol : 40
> Options compiled in:
>  linux release using_oss using_alsa using_backend using_dbox2
> using_dvb using_frontend using_hdhomerun using_iptv using_ivtv
> using_joystick_menu using_v4l using_x11 using_xrandr using_xv
> using_xvmc using_xvmcw using_xvmc_vld using_bindings_perl
> using_bindings_python using_opengl using_ffmpeg_threads using_live
>
> I created a playback profile that only uses xvmc.  The
> "playback" setting screen (3 of 9) has only one line that
> looks like this:
>
> if rez > 0 0 -> XvMC
>
> So I'm kinda at a loss.  I'm a newbie to MythTV so feel
> free to point out the obvious.  I'm a competent linux admin
> so if I need to run some more diagnostics from the command
> line, I'd be happy and able to do that.
>
> Any thoughts?


Also make sure you have the Composite extension disabled (double check the
XvMC page as I'm sure it mentions this)

Kevin
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