I recorded a 1 minute video, obviously at the normal speed, afterwards I decided to edit the same vid, I did that & cut off a bit from the front & a bit from the back, pressed save, all done I thought, but when I pressed playback it's sped up ?? So whilst the sound is normal the playback visual finishes before the sound does, I've tried to revert back to original, which it did & was fine, tried to do the same again & exactly the same thing happened ?..anyone ??