Where do I change the ffmeg location

Where do I change this ffmpeg location setting so it is right ?

ffmpeg

'E:\data' is not recognized as an internal or external command,
operable program or batch file.

the header_inc.php $dir['root'] had a space in the name.

I changed the directory name to no spaces and it works.

Did you switch to the windows version of ffmpeg as well ?  Just judging by the drive letter usage .. 

Yes, I don't know why the linux version has exe extension.  That has caused a lot of questions over the years where we had to convince people the ffmpeg.exe linux version was not a windows file.