I hope you can help with this. http://pastebin.com/xUXuS4Fs
It seems as though the output file can't be created (or is that a 'red herring', the error being in the java installation).
I have tried having the output placed on different drives; also inside and outside of the of the input file.
The original file name was long and had spaces in it. In case it was that I renamed it to just 1.wtv
System is Win 7, 64 bit