private int calcSpaceReq(MovieBox movie) { int sum = 0; TrakBox[] tracks = movie.getTracks(); for (int i = 0; i < tracks.length; i++) { TrakBox trakBox = tracks[i]; ChunkOffsetsBox stco = trakBox.getStco(); if (stco != null) sum += stco.getChunkOffsets().length * 4; } return sum; }