If you are using any version of Sony Movie Studio Platinum 12 or Sony Vegas Pro 12, then you must install Apple Quicktime.
Otherwise you will have problems importing, playing and rendering Apple video formats like Quicktime.
MP4 Video Playback on Windows Computers and potential Audio Sync issues
Also in this video, I talk about an Audio Synchronization problem which can occur sometimes with mp4's after they have been rendered in Sony Vegas Movie Studio. When playing back the video on a Windows PC, the Audio goes out of sync "sometimes". I discovered that this random problem is being caused by a setting in Apple Quicktime, that refers ONLY to PC's. So I show how to fix this problem.
Here is the download link for Apple Quicktime
April 2016 Security Vulnerability Announced
In April 2016, some security vulnerabilities were discovered in Apple Quicktime. Apple has also announced that they are no longer supporting the Windows version of Quicktime player.
Since the dawn of time, Sony Vegas Pro and Movie Studio Platinum have required that Quicktime be installed if you work with .MOV video files. If you don't have Quicktime installed, you can't work with .mov videos in both programs.
There is no need to panic about this development. From all the available information that I have read, the problem is only with the actual Quicktime player and not with the codecs that get installed with QT. The security flaws can only be activated if you tried to play a .mov video file in QT that is infected. Editing with .mov video files in Sony Vegas Pro and Movie Studio Platinum will not infect your computer. All you have to do is STOP playing videos with Quicktime and use a different media player. If you are super worried, delete the quicktimeplayer.exe file from your computer and then nothing bad can happen.
This problem is still unfolding, so the information may change at any moment. If you want to stay up to date with any developments, I suggest you read this thread on the official Sony Vegas Forum here.
Important Update for Windows 10/8.1/8.0 users and Installing Apple Quicktime
Apple has decided to spoil the fun of upgrading to Windows 10 and have added some code to the latest Quicktime version, which makes it impossible to install on a Windows 10 or Windows 8/8.1 computer. This may change in the future, but for now you will have to install an older version of Quicktime.
My suggestion is that you download and install version 7.7.6 from this page on the Apple website.
Movie Studio Minimum System Requirements
Statement from the Sony Creative Software website, indicates that Apple Quicktime is a requirement