MythTv DVB-T cards have the "Use hardware MPEG decoder" option
set. Without this some channels, that have multiple audio streams,
cause heavy stutter of the video/audio stream.
The MythTv "TVPlayback" de-interlace option is enabled and "bob"
de-interlace setting is selected. Without this the video can switch
from good picture to one with heavy motion jitter.
The MythTv "TVPlayback" aspect override option is set to "fill".
The MythTv "TVPlayback" "XvMC VLD hardware decoder" option is set
The Unichrome X-Server driver is set to "720x576Noscale" mode.
see xorg.conf
The file /etc/X11/XvMCConfig has the line "libviaXvMC.so.1" in
it.
MythTv has "Enable realtime priority threads" set.
MythTv has "Use Video as Timebase" in "TVPlayback" set.
MythTv has "Extra Audio Buffers" in "TVPlayback" set.