DURATION           62 libavfilter/asrc_sine.c     OPT_GENERIC(name, field, def, min, max, descr, DURATION, str, __VA_ARGS__)
DURATION         3407 libavformat/matroskadec.c     av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
DURATION           73 libavformat/webmdashenc.c                                                   DURATION, NULL, 0);