build_diff_map 537 libavfilter/vf_fieldmatch.c build_diff_map(fm, prvpf, prvf_linesize, nxtpf, nxtf_linesize, build_diff_map 540 libavfilter/vf_fieldmatch.c build_diff_map(fm, prvnf, prvf_linesize, nxtnf, nxtf_linesize,