Very cool! I plan on making a stereoscopic paragliding vid this spring, and will use a couple of hd hero 3s for it.
For synch, couldn't you use an audio cue to tie the two cameras together with?
"At variable framerate. As in, the timecode is actually accurate enough between the cameras, but when th...This may be obvious to you, but in case it can help even a little, I will add my "two cents worth" to this discussion: