We filmed a wedding with two Canon 7d's and accidentally had the cameras on different frame rates! One was filmed on 1920 x 1080 29.97fps, the other 1280 x 720 59.94. How can I edit these on the same sequence in final cut pro? I have tried all different sequence settings and even converted the 59.94 to 29.97 with no luck! The transitions look jumpy and the footage looks jittery or the sides are letter boxed on some clips and not others, it is just problem after problem and I just can't figure it out! All footage was put through mpeg streamclip to Apple Prores before importing into final cut.
What I suggest is that you start a new sequence and then drag the 1280x720 file to the timeline...final cut will ask you if you want to automatically conform the sequence to the clip's parameters, say "yes" to that.
Next drag the the 1920x1080 file to the timeline...it will automatically be converted to work with you first clip, - you may have to render first but now you should be all set to edit.