I'm using FCPX to index all my video "events". Things were sailing along nicely until I came up against an old file of my wife's graduation ceremony. At some point years ago, I converted the original .dv file into one giant 6GB .mpeg file, which seems to be identified as an Mpeg Program Stream, some kind of mpeg-2 wrapper.
The big problem is that it's interlaced, although I'm not sure if the interlacing is real 60i interlacing anymore, or - I suspect more likely - it's down to 30p with interlacing artifacts left over from how I converted it. Unfortunately, I don't have the original .dv file anymore, so I need to produce the cleanest source possible for this thing...
Here's the weird thing: If I run it through compressor and choose the video output as DV/DVCPRO, progressive, and choose the best de-interlacing, the resulting file opens with Quicktime and looks really good, with very little remaining interlacing artifacts. But then when I import it into FCPX, I still see very bad interlacing artifacts, like the trip through the Compressor did no good at all.