Streamclip? Premiere edits native.
Drop everything in a 720 timeline.
For the clips that dont need reframing you can use Scale to Framesize.
The rest you can reframe on the spot.
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Adobe Certified Expert Premiere Pro CS6
Adobe Community Professional
Funny behavior: My left clip has additional media, but my right does not. Premiere will allow me to drop the DTB on my right clip, and will extend the left clip, so that the transition begins at the start of the right clip, with the left clip fading, hitting black some 30 frames in, then fading up on the right clip.
That is normal behaviour. Every transition needs handles if it one clip does not have handles it will place itself off centre.
If there are no handles at all it will repeat frames.
Workaround is to use opacity keyframes.
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Adobe Certified Expert Premiere Pro CS6
Adobe Community Professional