On Fri, Dec 01, 2017 at 09:01:43 +0530, geet fm wrote: > ERROR: libmp3lame >= 3.98.3 not found [...] > --extra-libs=-lpthread \ This should be "-lpthreads" I believe. (It may not matter.) If that doesn't help, please try "-lpthreads -lm": http://ffmpeg.org/pipermail/ffmpeg-user/2017-October/037538.html Moritz