libavfilter/vf_xmedian.c: In function 'process_frame':
libavfilter/vf_xmedian.c:224:39: error: 'FFFrameSync {aka struct FFFrameSync}' has no member named 'duration'
     out->duration = av_rescale_q(s->fs.duration, s->fs.time_base, outlink->time_base);
                                       ^
make: *** [libavfilter/vf_xmedian.o] Error 1
make: *** Waiting for unfinished jobs....