For a few days, I have been wondering why there are so many video formats, AVI, MP4, MOV, WMV, 3GP?? and also why not all the devices support all kinds of video formats or they just support one format. If you are confused about the different video formats, and you are a Mac user, here I will give you a satisfying answer: Aiseesoft Video Converter for Mac (http://www.aiseesoft.com/video-converter-for-mac.html) With it you can convert all the popular video formats easily, such as convert AVI to MP4, convert WMV to 3GP and so on for Mac users. Here I will show you How to use it: Step 1: Download Aiseesoft Video Converter for Mac For Intel: http://www.aiseesoft.com/downloads/mac/video-converter-intel.dmg For Power PC: http://www.aiseesoft.com/downloads/mac/video-converter-power-pc.dmg Step 2: Load video Easily click ?Add File? to load your video that you want to convert. [Image: http://www.aiseesoft.com/images/guide/dvd-converter-suite-mac/video.jpg ] Step 3: Choose output profile and settings At the bottom of the interface there are a drop-download list named ?profile?. You can choose your output format here. [Image: http://www.aiseesoft.com/images/guide/dvd-ripper-for-mac/profile.jpg ] You can also adjust the settings of your output video, such as Resolution, Bit rate and so on. [Image: http://www.aiseesoft.com/images/guide/dvd-ripper-for-mac/settings.jpg ] After you finish the 3 steps, you can just click ?Start? button to start your conversion. Tips: 1. Trim If you want to pick up a part of the video to convert, please click ?Trim? button and drag the ?Start trim slider? to set the start time and ?End trim slider? to set the end time. (a) You can also do that by clicking the ?Start trim button? and ?End trim button? (b). The third way you do that is set the exact Start/End time at the right of the pop-up window and click ?OK?.(c) [Image: http://www.aiseesoft.com/images/guide/dvd-ripper-for-mac/trim.jpg ] 2. Crop If you want to remove the black edges or you want to convert a certain area of your video, please click the ?Crop? button. You can do this either by drag the frame around the movie (a) or set the crop value: ?Top, Left, Bottom, Right?.(b). Another way to do that is choose models from ?Crop Mode?(c). Aiseesoft Video Converter for Mac also allows you to chose the output aspect ratio above the crop pane, ?Keep Original, full screen, 16:9 and 4:3? are available. [Image: http://www.aiseesoft.com/images/guide/dvd-ripper-for-mac/crop.jpg ] 3. Effect If you want to adjust the effect of your movie, please click the ?Effect? button and a pop-up effect window will appear. It allows you to edit your movie?s effect including ?Brightness, Contrast, Hue, Saturation and Volume?. [Image: http://www.aiseesoft.com/images/guide/dvd-ripper-for-mac/effect.jpg ] The full conversion is complete, now you can just enjoy the video.