When you try to open a MPEG-1 or MPEG-2 file in Adobe Audition 3, either the file does not open or only the audio track in the file opens.
Open the MPEG file in an video editing or video processing application (such as Adobe Premiere Pro or Apple QuickTime Pro), and transcode (export) the video to an AVI, QuickTime, or Windows Media file. Then open that version of the video file in Audition.
Note: In order to use QuickTime movie files in Audition, QuickTime needs to be installed on your computer. Visit the Apple website at www.apple.com/quicktime to download QuickTime.
Adobe Audition 3 can not open MPEG-1 or MPEG-2 files. An earlier version of Audition, Adobe Audition 2.0, could read MPEG files only if it was installed as a part of the Adobe Creative Suite Production Studio software suite. (Audition does not include the software license required to encode and decode MPEG files; the license was a part of Production Studio.)