Strange export failure

Former Member
Former Member
I recently shot some footage with my Virb Elite facing forward and my Virb facing rearward. I inserted the required overlays on the Virb Elite footage (filesize 3.53Gb, 1080P, 25FPS) and it exported fine.
I then edited the Virb footage with no sound and no overlays, with the intention of inserting it (Picture in Picture).
Before export the footage showed a file size of 3.53Gb (1080P 25FPS), the file exported really quickly (30seconds) and wouldn't play, the file size in Windows Explorer showed as about 1.9Gb.
I changed the Resolution to 960P and the file exported fine.
Any ideas why one file would export and the other wouldn't, if anything I'd expect the footage with the overlays to be the one giving problems.