OK so I'll set the scenario. We have a camera we attach to our race-car to record races; it automatically records to an AVI format to an SD card. I can transfer this to my 2011 MacBook Air no problem, it plays in QuickTime, MPlayerX and VLC. But - I have no idea how to go about editing it. I've tried iMovie; but it apparently doesn't recognise the AVI; SmartVideo Convertor also doesn't transform the format into something iMovie can read. So, what piece of software will let me edit the video? Preferably something cheap/free! All I want to do is cut bits out at the beginning and end, so I can split into single laps or a video easily uploadable to YouTube. Right now the files are about 1.5GB... Thanks in advance for any help you can offer.