Do a search replace action in directory libavformat: S: codec_wav_tags R: ff_codec_wav_tags S: ff_codec_bmp_tags R: codec_bmp_tags ( You could use something like this command in the libavformat dir: perl -i.bak -p -e’s/codec_wav_tags/ff_codec_wav_tags/g’ *.c ) Come on guys, lets just try and help.....