Introduction - If you have any usage issues, please Google them yourself
http://www.voxgratia.org/bin/libavcodec-0.4.7-linux.bin.tar.gz.
Since you have already compiled H.263 plug-in just rename libavcoded.so in
downloaded tar.gz to avcodec and put it into $PWLIBPLUGINDIR and run
openmcu.
It should work fine if the architecture of machine on which this .so is
compiled matches with your machine s architecture. (I happened in my case).
I could see pretty fine video with this ffmpeg.