We didn’t capture the footage directly into FCPX on OJ Speaks. We captured the tapes using Blackmagic’s Media Express. The tape was captured at its original resolution and then upscaled in FCPX. The footage we received back from the post house looked worse than the footage we’d been cutting with in FCPX. They had used a Terenex for the conversion. In this case, they were converting digital files to digital files. Had they been converting tapes to digital, they may have had a better result. As it was, there were all sorts of frame blending artifacts, and the image was soft.
As Shane may have mentioned, we used an AJA Kona 3 on Challenger Disaster: Lost Tapes and captured within FCP7. When working from tape, this seems the best solution. For upscaling footage downloaded from a resource like AP, Conus, Getty, or Critical Past, software solutions probably fare best.
FCPX has great software scaling. So does Resolve. I’d take Shane’s advice on upscaling & conforming frame rates any day. He’s been a delight to work with on all of the 1895 Films projects. In fact, we collaborated on the workflow we used on Challenger Disaster: Lost Tapes. And despite the fact that he consistently drops the “P” from FCPX, he still does a great job with the online edit of some of the best documentaries cut in it.