MATROSKA_ID_BLOCKDURATION  596 libavformat/matroskadec.c     { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
MATROSKA_ID_BLOCKDURATION 1651 libavformat/matroskaenc.c     put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
MATROSKA_ID_BLOCKDURATION 1757 libavformat/matroskaenc.c         put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);