Avidemux 2.6.7 doesn't load all of 3 hour 40 minute video

[mattack]

So I downloaded a video from my TiVo, and want to edit in into pieces so I can watch it on my iPad with VLC (I don't have enough space for the whole video).

If I open the video in Avidemux 2.6.7, the video stops at about an hour and 47 minutes.  The whole video loads in Quicktime Player (but I can't successfully save there after I use its primitive split capability).  I've never seen this issue with Avidemux before.

Nothing shows up in Console when searching for Avidemux either.  Is there some way I can get more info to provide?