There isn't much documentation on this that I can
find, but I wanted to share something I found.  While
looking for a userspace way to alleviate my issue with
bug #55, I found that I get great video on my TV (with
no interlacing artifacts) with the following
combination of settings.

Note that I am using the xv/yuv output mode for video
playback, not the mpeg2 decoder.

1) Use ivtvctl to set yuv-mode to 1 (progressive). 
(my input is NTSC on svideo 0)
ivtvctl --set-yuv-mode=mode=1

2) Turn off deinterlacing in mythtv TV playback.

Now, video output is clear, crisp, and has no
interlace artifacts.  This might be more obvious to
others, but it wasn't to me.

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