easyjasub

easyjasub (http://easyjasub.sf.net) is a tool to assist in understanding Japanese subtitles those who have a little knowledge of Japanese language, for language learning. It allows you to get subtitles with furigana and in-line translation, in several formats suitable for both video rendering and self-study

Timing for the Japanese subtitles is used, the secondary subtitles may be repeated into multiple lines.
The synchronization of input text subtitles is very important to properly 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 -tr