Movie Maker and Large Output Files

I am outputting from Movie Maker a video about 30 minutes in duration.   I'm using the "recommended" output format (1920 x 1080), and the output file size is a little over 4GB.  (The input content is iPAD .mov files, and a small amount of added sound.).

 

There is a problem with the output file, given that:

- WMP complains it can't play it;

- MediaInfo is unable to produce a sensible analysis of the file.   It only produces this:

 

General
Complete name                            : V:\ZZHome Movies - Trial\3009 Soccer U6 B1 2013 Highlights.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42
File size                                : 4.31 GiB

 

I have encountered this problem before for large output file size.

 

The current project has produced good outputs repeatedly, as I progressively added content.    The last successful output file size (for the current project) was about 2.9GB.   Today, I added more content, taking the output file to over 4GB, and the file is not playable.    

 

Is there a problem connected with large output files?