: Software often gets "stuck" on old file data. Go to Preferences > Media Cache and delete all files.
: If your default player fails, use VLC Media Player which includes its own codecs to play almost any video format. 2. Fixing Import and Playback Errors g60329.mp4
: A quick "hack" is to change the file extension from .mp4 to .mpg . This forces the software to use a different internal importer. 3. Transcoding: The "Nuclear Option" : Software often gets "stuck" on old file data