Avidemux 2.6.4 - Incorrect Video Run Time When Opening .flv File

[Tgoo]

Hello,

I just started using Avidemux and so far I have found it to be a great program.  However, I am having an issue when I try to open a .flv file to cut.  Avidemux only loads a small portion of it (00:01:43:266).  The actual video size is 57m 55s.  I have tried uninstalling and re-installing the program, searching for similar issues and deleting the appdata.  I have already cut a .flv file successfully, but I am having trouble with the second.  My OS is Windows 7 64 bit and I am using version 2.6.4 Avidemux.  Any help or advice is greatly appreciated.

Thanks