Hello Izzy,
It sounds like you’ve got a couple of workflow issues here.
1. SCC files cannot be used for HD closed captioning because they only contain CEA-608 data, which is the analog SD captioning standard. If you try to use a .scc file when your output format is HD, FCP7 is supposed to give you a warning that the caption file is not compatible with the output format, however for some reason the warning doesn’t always appear.
DTV broadcasts require CEA-708 closed caption data. At this time, CPC’s MacCaption software is the world’s only CEA-708 software encoder which doesn’t require a hardware caption encoder. MacCaption can import a .scc file and upconvert the data to a CEA-708 track for FCP7 and AJA KONA high definition output. MacCaption also has an Assemble Captions feature which allows you to edit previously captioned videos in FCP without having to re-caption the whole thing from scratch.
2. Currently, FCP7 with AJA KONA only supports closed captioning in 1080i29.97 and 720p59.94 frame rates, not 24p. (Technically it is possible to put captions on native 24p video, but only very high end professional gear can display native 24p with captions. DTV broadcasts are always 720p59.94 or 1080i29.97, so you will have to telecine your 24p video to 60i/60p at some point.)
CPC has worked with AJA and Apple to develop these workflows. We are the industry’s “go-to” people for closed captioning solutions. Please call or e-mail us, or check out our website at the link below if you’d like to learn about our solutions.
Jason Livingston
CPC