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I have a pair of video clips (mp4) that I would like to join into 1. The internet tells me that I can do this with Quicktime.

Unfortunately, whenever I try exporting joined clips, with clips of any size, I get the same error:

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"The operation could not be completed; an unknown error occured"

If I try to save, rather than export, I cannot. But if I try and close, I'm given an option to save. If I choose to save then, I get this error:

enter image description here

Can anyone tell me what were I'm going wrong?

For full information: there is a two minute video of me running into the problem here

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