Mp4 file name extensions (formats) are not compatible with Magix Movie Edit Pro14/15. You will have to convert the file to an .avi, mpg or other format to use in the program.
There are a number of places from which a person can get a guide on how to use Magix Movie Edit Pro. One such place is Magix's own website, another is YouTube.
You should be able to import and edit Kodak Playsport videos in Magix Movie Edit Pro if the file formats are compatible with Magix Movie Edit Pro. Have you tried importing a video? If not, try it. If the file format is not compatible, then you will need to convert it to a format (file name extension) used by Magix Movie Edit Pro before importation. I don't have my Movie Magix manual handy to tell you the extensions that are compatible, but what you can do is check yours (if you have the manual). If you don't have the program documentation, go online and do a search for compatible formats.
Click on the un-group button (broken link icon) from the ribbon menu in the Time-line view of Magix Movie Edit Pro 16. The 'group' and 'un-group' feature can be accessed once a file on the time-line has been clicked.
Click on the video and use the 'ungroup' feature. It will separate the audio and video track. Then delete the audio track.
Sony Vegas, Magix Movie Pro Edit 14.
Adobe Premiere, Song Vegas and Magix movie edit are one of the good movie makers
There are free versions of Magix Movie Edit Pro available from the link I've posted for you in the Related linkssection below. However, these are only 'trial' evaluations that will expire after a period of time. Then you will have to purchase the program.
Try accessing the application from the Program files > Start, All Programs, Magix folder, application (exe).
Magix Movie Edit Pro 15 will add effects and is easy to use.
Magix Movie Edit Pro 15.0 Plus and Vegas Movie Studio 9 are two programs you can use to easily use and learn to edit movies.
The free 2.6 version of Windows Movie Maker or Magix Movie Edit Pro 16 (a purchased program). Just my opinion though.
You can't edit songs in Windows Movie Maker. Any audio editing has to be done on an external audio editing program prior to importation. The most you can do with the audio/song is reduce the volume, mute, fade in/out.