I am using Magix ProX14 and have created a video file after 2 days of editing. I was having problems with some of the content having serious audio video slippage. Finally managed to create a full 1920x1080P50 file 6.5GB with no issues. Now trying to reduce the video size to send to a client for assessment using the HD file. Whenever I export this now it creates a lower quality file but the audio and video is miles out of sync and everything is far too fast, anyone any ideas please? I have never had this issue before until now.