go through and find everything it installed and remove it by hand. you should be making packages for this ( and other - such as updating your rpm database) reason. to get you started, here is what came with my ffmpeg ( don't know how similar yours will be depending on version, options, etc...):
usr/doc/ffmpeg-CVS20050314/
usr/doc/ffmpeg-CVS20050314/COPYING
usr/doc/ffmpeg-CVS20050314/CREDITS
usr/doc/ffmpeg-CVS20050314/Changelog
usr/doc/ffmpeg-CVS20050314/INSTALL
usr/doc/ffmpeg-CVS20050314/README
usr/doc/ffmpeg-CVS20050314/doc/
usr/doc/ffmpeg-CVS20050314/doc/CVS/
usr/doc/ffmpeg-CVS20050314/doc/CVS/Root
usr/doc/ffmpeg-CVS20050314/doc/CVS/Repository
usr/doc/ffmpeg-CVS20050314/doc/CVS/Entries
usr/doc/ffmpeg-CVS20050314/doc/.cvsignore
usr/doc/ffmpeg-CVS20050314/doc/Makefile
usr/doc/ffmpeg-CVS20050314/doc/TODO
usr/doc/ffmpeg-CVS20050314/doc/faq.texi
usr/doc/ffmpeg-CVS20050314/doc/ffmpeg-doc.texi
usr/doc/ffmpeg-CVS20050314/doc/ffmpeg_powerpc_performance_evaluation_howto.txt
usr/doc/ffmpeg-CVS20050314/doc/ffplay-doc.texi
usr/doc/ffmpeg-CVS20050314/doc/ffserver-doc.texi
usr/doc/ffmpeg-CVS20050314/doc/ffserver.conf
usr/doc/ffmpeg-CVS20050314/doc/hooks.texi
usr/doc/ffmpeg-CVS20050314/doc/optimization.txt
usr/doc/ffmpeg-CVS20050314/doc/texi2pod.pl
usr/bin/
usr/bin/ffmpeg
usr/bin/ffplay
usr/bin/ffserver
usr/include/
usr/include/ffmpeg/
usr/include/ffmpeg/avcodec.h
usr/include/ffmpeg/avformat.h
usr/include/ffmpeg/avio.h
usr/include/ffmpeg/common.h
usr/include/ffmpeg/rational.h
usr/include/ffmpeg/rtp.h
usr/include/ffmpeg/rtsp.h
usr/include/ffmpeg/rtspcodes.h
usr/lib/
usr/lib/libavcodec-0.4.9-pre1.so
usr/lib/libavformat-0.4.9-pre1.so
usr/lib/vhook/
usr/lib/vhook/drawtext.so
usr/lib/vhook/fish.so
usr/lib/vhook/null.so
usr/lib/vhook/ppm.so
usr/lib/vhook/watermark.so
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