QT does indeed do the job, but there is no chance of tine tuning so didn't really cut the mustard for me (which is a shame as the functionality is all there but you can't drill down the accuracy).
Used MPEG Streamclip in the end which despite being a very sloppy (and half broken due to being on Yosemite) front end UI seems to be backed by some pretty heavy duty machinery so this tool will do the job nicely for now
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