FYI: Result from some discussion between me and DieBagger (aMPdroid developer) is that this isn't worth fixing, as RTSP over WAN probably isn't really usable - it uses too much bandwidth and is too unstable. Also, the RTSP option might get removed from aMPdroid in the near future.
You're joking me! RTSP option might get removed?
Ffmpeg streams use much more CPU on my HTPC than a native RTSP stream, only for that reason it should be maintained.