Brand new windows 8 laptop (with Windows 8.1)

All drivers pre-installed or updated with Windows 8.1

Windows update is current (no new patches available)

I recorded a 45 minute interview using the "Camera" app in windows 8.  It saved the file as an Mp4 (so content was generated natively with installed codex).  The movie plays fine as is, but I need to upload it to youtube.  As is the file is 2GB, so it will take too long to upload, so I tried editing with Windows Live Movie Maker.  The file loads fine and I can do edits, but no matter what I choose as save format results in the audio being off by 30+ seconds by the end of the video.

This seems like the exact scenario in all the windows advertisements (Capture, Edit, Publish), but just does not work.  Doing research, it seems like audio/sync issue are typically a result of variable bit rates for audio, but I can find no way to set constant bit rate for these videos.  Is there any way to address these audio/video sync issues for long videos?