[mythtv-users] Two really, really annoying plabyack problems

[Kevin Kuphal]

On Feb 18, 2008 10:17 AM, Yan Seiner <yan at seiner.com> wrote:

> I'm experiencing two incredibly annoying playback problems:
>
> 1.  "partial" deinterlacing.  I can see de-interlace artifacts.  On fast
> movement, the image breaks up in horizontal stripes.  It's not as bad as
> no deinterlace at all, but it's noticeable.  If I turn off
> de-interlacing, it gets a lot worse.
>
> 2. play-stutter-play.  The HD playback will play for a few seconds, then
> - just perceptibly - stutter - then play again.  There is no related
> audio stutter.  It's as if every few seconds, the system drops every
> other frame for a second, then continues.  This *only* happens on HD
> playback.
>
> I'm running SVN.   The system has a AMD Athlon(tm) 64 Processor 3200+
> CPU and an nVidia 6200 card:
> 01:00.0 VGA compatible controller: nVidia Corporation NV43 [GeForce
> 6200] (rev a1)
>
> This only happens on this system.  Another frontend, which only has an
> old Athlon XP 2000+ CPU and an nVidia 5200 card doesn't have that
> problem at all - and it runs at 40-50% CPU when playing HD.
>
> Source code version     : Unknown
> SVN Branch              : trunk
> Library API version     : 0.21.20070910-2
> Network Protocol Version: 36
> 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_lirc using_opengl_vsync using_v4l using_x11 using_xrandr using_xv
> using_xvmc using_xvmcw using_xvmc_vld using_bindings_perl using_opengl
> using_live
>
> I've been through the wiki, and tried the various suggestions, I've
> tried all sorts of deinterlacers, XvMC, ffmpeg, you name it, and nothing
> seems to help.
>
> I am attaching the logfile from the frontend.  I see two problems:  one
> is the
> VideoOutputXv: XvMC Adaptor Name: 'NV17 Video Texture' X Error: BadMatch
> error, and the other is the
> Failed to enable deinterlacing
> message.
>
> Can anyone give me some hints on how to fix this?


My first suspect would be the nvidia drivers.  I know that my 5200 can play
back anything I throw at it while I've heard of many problems on list here
from people using 6,7, or 8000 series cards which you would think would be
better.

As for the first, does the effect disappear if you force the scan type to
Progressive on the menu during playback?  I found that NBC-HD (for me) sends
mixed frames which Myth rightfully respects but in actually are coded wrong
resulting in poor playback.  If I lock the frame type to progressive (IIRC)
then it is fixed.

Kevin
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