Just a short note on replacing sub-titles, the inimically named .ass file, in a fansub. I’m enjoying Nabari no Ou, courtesy of Rumi’s hard work. Tried to replace the second episode’s sub-titles and faithfully followed the instructions but I got the above NO U CAN’T HAZ A MKV message:
Error: The name of the output file ‘F:\anime\partial\Nabari no Ou\[Rumi]_Nabari_no_Ou_02_[1280x720][H264]_[85945779].mkv’ and of one of the input files is the same. This would cause mkvmerge to overwrite one of your input files. This is most likely not what you want.
Finally figured out that all I needed to do was to go to ‘File’, then ‘Set Output File’ and designate a new file name (just added ‘v3′ after the episode number) and huzzah. Doh!