My family attended a wedding recently, and my three-year-old son had a great time cutting it up on the dance floor. I took a long video of him dancing with my iPhone 4S, but when I got home, I realize that the entire video was rotated 90° (so it was sideways). Not only that, but due to HD being the only option with the iPhone (and iPad) camera app, the video was also a huge file, which makes it a bit more difficult to share. Fortunately, the free Apple application Quicktime, that comes with every Mac computer, makes it easy to deal with these problems in just a few steps.
1) Drag the icon for your video (from iPhoto or anywhere) to the Quicktime application.
2) If you need to rotate the video, simply go to the Edit menu, and you’ll find options to either Rotate or Flip the video. You can even Rotate twice to make a video upside down.
3) Now that you’re done, you need to Export your video. There are a lot of options under Export, but I prefer to use a trick of sorts. I select Export for Web, then make sure all three options are checked, I type in a name for the export (while taking note of where it will be saved on my computer), then I press the Export button. It may take awhile, depending on the length of the video and the speed of your Mac, so you may want to do something else while Quicktime works away at creating three new, smaller video files.
4) When the export is done, fine the folder (with the name you gave it, wherever you saved it), open the folder, then open the enclosed folder named Resources. Inside that folder you’ll see three files ending in .m4v, with varying sizes, all much smaller than the original video.
5) You can drag any of these files into Quicktime or iPhoto, and they’ll work perfectly. But if you double-click the video, your Mac may not know which app to use. So here’s a trick: just click the file names and change .m4v to .mov for each file. Your Mac will ask you if you really want to do it, just say yes. Now your Mac will know to open the file using Quicktime.
6) So now you can watch each video and review each file size, and decide which you want to share. You’ll see, even the biggest file has a much smaller file size than the original video, thus making it easier to share (such as uploading it to YouTube or Facebook). You may even find the smallest video file is small enough to email. And you’ve also fixed that annoying video that was sideways (often happens if you’re moving your iPhone around when you start the video, such as if you’re dancing, or a roller coaster, etc.). Just note that these new files are not of the same quality of your original video, so if you want to keep your original highest quality source, don’t throw the original away.