Yes I am using the free version. I compiled libx264 myself. It worked beautifully in 13.10 but will not work in 14.04.
here is the output of locate libavcodec.so</span>
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/usr/lib/i386-linux-gnu/libavcodec.so.54
/usr/lib/i386-linux-gnu/libavcodec.so.54.35.0
/usr/lib/i386-linux-gnu/i686/cmov/libavcodec.so.54
/usr/lib/i386-linux-gnu/i686/cmov/libavcodec.so.54.35.0