Sure, thanks. The log seems oddly formatted? But here is what spit out from the command line you specified.
Edit: There was an error in the first copy of the above log.
Updated Debug.zip w/ Debug1a.zip.
It could be that something is off with their encode of just this particular session.
For comparison, here is the debug log from FlvFixer.php for the .flv file joined by binary file copy rather than ffmpeg.