DSS won't stream 3GP's encoded with FFMPEG

Question

I have setup Darwin Streaming Server which streams the included sample 3GP files pretty well. However when I try to encode my own 3GPs using FFMPEG and stream them, it doesn't work. (I test the streaming using VLC Player).

Here is the command I use for encoding:

ffmpeg -i test.flv -acodec aac -ar 22050 -ab 128kb -vcodec mpeg4 -b 256k -mbd 2 -flags +4mv+aic -trellis 1 -cmp 1 -y test.3gp

Do I need a special way to encode the 3gp's for streaming?