easyjasub
Tool to add furigana and in-line translation to Japanese subtitles
... associate them.
The program is now in early development stage, you may need to read the the inline help (-h option) or browse the code in http://github.com/riccardove/easyjasub
A JRE is required, even by the Windows .exe version.
wkhtmltoimage is required, take it from http://sf.net/p/wkhtmltopdf
BDSup2Sub may be useful (BDN/XML subtitles are created as intermediate output).
Basic usage:
easyjasub.exe -ja subtitle.jp.srt -tr subtitle.en.srt
java -jar easyjasub-cmd.jar -ja subtitle.jp.srt...