First I want to say this is a great app, I can stream mp4, transcode mkv etc to iphone/ipod. I was wondering if the app can do rmvb transcode since rmvb can be decoded using Real alternative in FFMPEG. Most of the transcode software just need the codec to work on the input side.
RMVB support will be added in next bugfix server update (will probably be released in a day or two). Although given the proprietary nature of rv* codecs I'm not sure how solid the implementation in libavcodec is and whether it works with all videos (it worked with couple that I tested).