Videomaker – Learn video production and editing, camera reviews › Forums › General › Video and Film Discussion › HELP How to convert .mts files for use in Final Cut Pro 7 › MPEG Streamclip can export
MPEG Streamclip can export 1920X1080, though. So I don’t understand why you still can’t use that program. Also, work with ProRes files in FCP, not H.264.
If MPEG Streamclip really isn’t working for you, have you tried Compressor?