In fact, Sony Movie Studio Platinum 13 may not work with some MP4 files, that probably caused by the unsupported codec or other reasons. To fix the problem, a more practical way recommended online is to transcode MP4 to a more editing-friendly format for Sony Movie Studio. Once you have, you can add them to Sony Movie Studio (Platinum 13) and use MP4 like any other file Sony Movie Studio supports. After testing, Dimo Video Converter Ultimate was found to be an easy-to-use yet powerful high-quality MP4 video converter, player and editor. By running it, there is no need to to set the codec yourself, the program has an optimized preset for Sony Vegas.
Besides that, it not only can handle MP4 files to be compatible with Sony Movie Studio (or other NLEs on PC, like Windows Movie Maker, Premiere Pro, After Effect CC, Davinci, GoPro Studio, FCP, Avid MC, etc) quickly and easily, but also offers some cool video editing features like cropping, rotating, cutting, adjusting effects, adding watermark, and so on.
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