Hi Ian,
as MrC already suggested, please do not attach log files or other stuff to your post as it can take some days until a moderator approves it. Right now I can't see your attached file.
If I understand you correctly, you always want to use the High Quality 2-pass VBR mode. Please do not do this for bitrates above 7500 kbps, because the ffmpeg parameters are not intended for such high bitrates (ffmpeg might throw an error), and it also does not make much sense. CBR is a better choice in these cases.
You should modify the ff_vbr batch file like this:
Replace the section under the :doit label with:
Code:
:doit
IF [%bitrate%==[ GOTO dont_touch
IF %bitrate% GTR 7500 GOTO CBR
GOTO 2pass
If you cannot fill the disk using this code then the requested bitrate is high enough to reach the max bitrate limit. The only way to get a bigger file size in this case would be to use padding, but ffmpeg does not do this (completely useless, quality would be the same).
Cheers
manolito