Finally ffmpeg started supporting rmvb (RV30 and RV40) format, I guess I’ve been waiting for this for years.
Now I’m able to convert all those rmvb files (well, you know where I got them …) to mobile format that I can watch on my mobile devices. I used to use some rm -> avi converters to do the trick but obviously it was not convenience as they are running on Windows only and cannot programmatically process files, and I do need the feature.
Not sure how fast Ubuntu can take the latest ffpmeg, but I can always build from svn so it is not a big case.