Interlacing and ffmpegx (mac)

[frayadjacent]

Hi all,

I'm following damned_colonial's tutorial for exporting vids for vividcon on a mac.  Everything seems to work fine *except* that the final video file from ffmpegx is a little interlaced looking -- or actually it more reminds me of descriptions I've read of what happens when you de-interlace progressive flim (the pixelly-liney appearance is most obvious on diagonal lines rather than during fast motion).  I de-interlaced when I exported from FCP, but I didn't check de-interlace on ffmpegx (and get an error if I do, in fact).  I also chose "not interlaced" under options.  I get the same result if I switch "not interlaced" to "frame", and if I try switching "not interlaced" to "field" I get another error.

Anyone dealt with this?

Thanks!