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基於海思媒體庫視訊H264打包成RTP包

NAL unit header or first byte of the payload
        0... .... = F bit: No bit errors or other syntax violations
        .11. .... = Nal_ref_idc (NRI): 3
        ...0 0111 = Type: NAL unit - Sequence parameter set (7)
    H264 NAL Unit Payload
        0100 1101 = Profile_idc: Main profile (77)
        0... .... = Constraint_set0_flag: 0
        .0.. .... = Constraint_set1_flag: 0
        ..0. .... = Constraint_set2_flag: 0
        ...0 .... = Constraint_set3_flag: 0
        .... 0... = Constraint_set4_flag: 0
        .... .0.. = Constraint_set5_flag: 0
        .... ..00 = Reserved_zero_2bits: 0
        0001 0100 = Level_id: 20 [Level 2.0 2 Mb/s]
        1... .... = seq_parameter_set_id: 0
        .001 01.. = log2_max_frame_num_minus4: 4
        .... ..01  1... .... = pic_order_cnt_type: 2
        .010 .... = num_ref_frames: 1
        .... 1... = gaps_in_frame_num_value_allowed_flag: 1
        .... .000  0101 10.. = pic_width_in_mbs_minus1: 21
        .... ..00  0010 010. = pic_height_in_map_units_minus1: 17
        .... ...1 = frame_mbs_only_flag: 1
        1... .... = direct_8x8_inference_flag: 1
        .0.. .... = frame_cropping_flag: 0
        ..0. .... = vui_parameters_present_flag: 0
        ...1 .... = rbsp_stop_bit: 1
        .... 0000 = rbsp_trailing_bits: 0