15Gb m2ts wedding ceremony file is showing less than it should

[Epix]

Hello guys and thank you for your help. I'm struggling with a file that is not recognized as it should, so I'm asking help as to which software can help me.

I've taken a screenshot that maybe explains without that many words what is going on. I don't own the source SDHC card anymore and it was recorded on a Sony NX5 brand new camera that didn't show any other problems than this one (assuming it's a cameras fault - that maybe is not).

ANY help is appreciated... Maybe this is a Table of Contents issue - something got messed up and I need a software to fix inside the m2ts, don't know. I know I didin't sleep this night, this is my living and losing this... well, let me try to get positive...

 

[Epix]

Adding more info

Adding more info

It does not play on CMU now. Its browser shows a blank square and an 'x', meaning the file is not readable. Sony Vegas reads 48 minutes of this 15 Gb file - and it takes quite sometime to read the file and its characteristics. There was another camera that is simillar to NX5, the AX2000 recording the wedding ceremony. It came up with a 14.5 Gb file (it's listed in the screenshot I sent) with 1 hour, 28 minutes of footage.

I'm attaching another two screenshots, CMU's and Vegas'.