MATROSKA_ID_BLOCKDURATION  725 libavformat/matroskadec.c     { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
MATROSKA_ID_BLOCKDURATION 2156 libavformat/matroskaenc.c     put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
MATROSKA_ID_BLOCKDURATION 2345 libavformat/matroskaenc.c             put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);