FLV Encoding problems

I’ve recently spent about 10+ hours rendering FLV videos only to discover that majority of them have major interlacing problems. I know for a fact the source video is fine as I did them myself.

I’m using the FLash8VideoEncoder that came with Flash 8. Is there something else that does it better? I’ve tweaked and played with several of the settings but nothing seems to work and it’s kind of embarising cause my clients think my videos have major interlacing.

Any help would be awesome!!! Thanks!