Smart Converter only converts the parts of your movie that need it and leaves the rest alone. In some cases just one or the other need converting, and in a few cases both will need converting. In many cases neither the video nor the audio need converting. When you drop a media file into Smart Converter and choose a conversion type, it immediately analyses your file and works out what needs to be converted. Just drag your file into Smart Converter, select an output preset and click convert. It will also add your converted file to iTunes automatically. Smart Converter handles 100s of file types and converts so they play on your favourite devices. Smart Converter is the fastest, easiest to use video converter on the App Store, thanks to it's Smart Conversion technology.