I use MPEG Streamclip to convert h264 files from Canon DSLRs to ProRes' (either proxies or higher bitrate ones). My problem is that whenever I import the ProRes files into Final Cut, drag any of them onto a sequence and allow FCP to adjust sequence settings to match the media settings, the sequence shows up as an interlaced one. I always uncheck "interlaced scaling" in MPEG Streamclip and tried both checking "deinterlace" and leaving it untouched but always have the same problem.
Please check it out before responding - it's not some "that's weird, maybe your settings are wrong" thing - rather a flaw in MPEG Streamclip conversion of ProRes files or any codecs that allow interlaced and progressive scans (as opposed to ex. XDCAMs that have the scan type implied in the codec name - HD422 1080p25 or HD422 1080i50).