This is with ekiga 3.2.7 and opal 3.6.8 in openSUSE

The problem is that the latest version of the ffmpeg libs no longer exports the individual encoder/decoders in the shared library, so configure no longer finds them and even if you force override that, DYNA will not load them.  The fix is just to make opal behave properly and to an avcodec_register_all instead of trying to register the individual ones (The stated reason, that the binary will be smaller, is rubbish on a shared lib system).  The configure.ac script also has to be updated to check for the existence of codecs using avcodec_find_encoder/decoder.