Trouble exporting - exported file unable to 'convert'

hello all,

 

i'm having issues exporting project. have 50 min wedding video attempting export continues fail every time try so. shot project 2 canon 70ds , canon t3i video imported .mov files. of audio straight off camera mixed audio zoom had plugged pa. part of video, files shot @ 30 fps , second cameraman accidentally shot few takes @ 60fps. guessing issue stemming from, cannot understand why since "highlight" (montage) video created uses of same videos (some different fps) , exported fine under h.264 @ 1920x1080. anyway, when go export sequence, after taking 2.5 hours export under h.264 format @ 1920x1080, file looks if has exported. once go file , click on it, quicktime 'converting' window pops followed "cannot open file" message. has encountered similar issue? if please help! suppose send video couple tomorrow , running out of time

are able use in/out points export small portions isolate problem?

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