Canon Powershot Sd800 Is

Canon PowerShot SD800 I do not upload a video to my macbook … suggestions?
I connect via USB and up Recently the video uploaded to iPhoto … I have also tried to capture images and not working well … It freezes … acts as it is still downloading, but keeps the screen for hours … this video is really important so if anyone has any suggestions will be appreciated!
Make sure that the costs of charging infrastructure supports MacBook – or with a mac in general.
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