Seems to me, these functions were introduced in -r6528
undeclared function id3tag_set_comment_ucs2 and id3tag_set_fieldvalue_ucs2
I just see Visual Studio 2017 does not allow to set Platform Toolset v100 any more. :(
I call ffmpeg like -vn -c:a libmp3lame -q:a 2 -compression_level 0 -cutoff 19500 and the exception is thrown. There's no exception without the cutoff argument, however. I cannot reproduce this behaviour with the lame.exe (v3.100; x64) provided by http://www.rarewares.org/files/mp3/?C=M;O=D
Expression: vbrsf[sfb] >= vbrsfmin[sfb]
pipe decoded audio from ffmpeg to sox
Please updae LibFlac.vcxproj to work with flac 1.3
Z_SOLO macro in LibZLib.vcxproj