A lot of times when youre dealing with video you run into a situation where you want to merge a movie file with another but arent concerned with things like transitions or titles. Using a video editor like iMovie does the job but its far too much effort for something so simple. Luckily, hidden in the standard free version of Apples QuickTime Player is the ability to drag & drop video clips together.
To start off, open a video in QuickTime. Now position the programs playhead where you would like your next video clip to be inserted. It can be at the beginning, anywhere in the middle, or right at the end. Once you have done that, locate your second movie file in Finder. Select the file and drag & drop it right onto the QuickTime window. Playing the whole movie will reveal that the clips have now been combined and are acting as if they were a single video. This trick can be applied with any number of files youre not limited to just two.
Heres where things get kind of tricky. Since only QuickTime Pro has the ability to save movies from the File menu, we dont have the luxury of using that option here. Instead, you have to close the video. Only then will you be greeted with the option of saving your merged file. Click the Save button and, in the dialog box that comes up, choose Save as a self-contained movie. It gets messy if you dont choose this setting, so make sure you dont skip it before continuing. Click Save once more and you will have a merged movie created entirely with the free version of QuickTime!
One last bit of information for anyone who is curious
you can combine any video format that QuickTime supports (both out-of-the-box and with the help of plugins like Flip4Mac and Perian). So a .mov file can be dragged on top of a .avi file, a .mp4 can be merged with a .wmv, and so on. Varying video resolutions can also be combined, although the smaller file will be anchored to the top-left corner with black filling the rest of the frame. It would be nice if it scaled to fit the larger videos resolution, but thats getting picky. Free is free, right?