MAX_GOP_SIZE
bs_write_ue(s, ilog2(MAX_GOP_SIZE) - 4); /* log2_max_frame_num_minus4 */
bs_write_ue(s, ilog2(MAX_GOP_SIZE) - 4);
bs_write(s, ilog2(MAX_GOP_SIZE), frame_gop_seqno); /* frame_num */
bs_write(s, ilog2(MAX_GOP_SIZE), frame_gop_seqno);
1, MAX_GOP_SIZE, 1, GOP_SIZE);
#define GOP_SIZE MAX_GOP_SIZE