After some reasearch for a good performing java library to do different video conversions, we stumbled over many projects.
On closer inspection we found that most of them are old projects, with no one maintainig them any longer.
We finaly got to the jave project which did what we needed.
Unfortunally it is based on a old version of ffmpeg, which has some problems depending on the input/output formats used.
So we did upgrade the binaries, adapted the parsing code and added a few new features to the library.
After some time trying to contact the original author to push back the changes upstream, we descided to create a new project which is maintained by us.
We named this Jave2, to show the difference to the original jave probject.
The project is hosted on github, you can find it here.