MATROSKA_ID_TRACKDEFAULTDURATION  560 libavformat/matroskadec.c     { MATROSKA_ID_TRACKDEFAULTDURATION,  EBML_UINT,  0, offsetof(MatroskaTrack, default_duration) },
MATROSKA_ID_TRACKDEFAULTDURATION 1220 libavformat/matroskaenc.c             put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
MATROSKA_ID_TRACKDEFAULTDURATION 1223 libavformat/matroskaenc.c             put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->r_frame_rate.den / st->r_frame_rate.num);