ISO Base Media Format (video mp4) Colour Description - tonykwok/made-mistakes-again GitHub Wiki
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+ 4
10A0D38 AVC decode (49 bytes)
10A0D38 Header (8 bytes)
10A0D38 Size: 49 (0x00000031)
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+ 4
10A0D3C Name: avcC
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+ 1
10A0D40 Version: 1 (0x01)
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+ 1
10A0D41 Specific (40 bytes)
10A0D41 AVCProfileIndication: 100 (0x64)
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+ 1
10A0D42 profile_compatibility: 0 (0x00)
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+ 1
10A0D43 AVCLevelIndication: 41 (0x29)
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+ 1
10A0D44 reserved: 63 (0x3F) - (6 bits)
10A0D44 lengthSizeMinusOne: 3 (0x3) - (2 bits)
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+ 1
10A0D45 reserved: 7 (0x7) - (3 bits)
10A0D45 numOfSequenceParameterSets: 1 (0x01) - (5 bits)
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+ 2
10A0D46 seq_parameter_set (23 bytes)
10A0D46 sequenceParameterSetLength: 21 (0x0015)
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+ 1
10A0D48 nal_ref_idc: 3 (0x3) - (2 bits)
10A0D48 nal_unit_type: 7 (0x7) - (5 bits)
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+ 1
10A0D49 profile_idc: 100 (0x64)
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+ 1
10A0D4A constraints (1 bytes)
10A0D4A constraint_set0_flag: No
10A0D4A constraint_set1_flag: No
10A0D4A constraint_set2_flag: No
10A0D4A constraint_set3_flag: No
10A0D4A constraint_set4_flag: No
10A0D4A constraint_set5_flag: No
10A0D4A reserved_zero_2bits: 0 (0x0) - (2 bits)
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+ 1
10A0D4B level_idc: 41 (0x29) - (8 bits)
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+ ?
10A0D4C seq_parameter_set_id: 0 (0x0)
10A0D4C high profile specific (1 bytes)
10A0D4C chroma_format_idc: 1 (0x1) - 4:2:0
10A0D4C bit_depth_luma_minus8: 0 (0x0)
10A0D4C bit_depth_chroma_minus8: 0 (0x0)
10A0D4C qpprime_y_zero_transform_bypass_flag: No
10A0D4C seq_scaling_matrix_present_flag: No
10A0D4D log2_max_frame_num_minus4: 4 (0x4)
10A0D4D pic_order_cnt_type: 0 (0x0)
10A0D4D log2_max_pic_order_cnt_lsb_minus4: 4 (0x4)
10A0D4E max_num_ref_frames: 4 (0x4)
10A0D4F gaps_in_frame_num_value_allowed_flag: Yes
10A0D4F pic_width_in_mbs_minus1: 67 (0x043)
10A0D50 pic_height_in_map_units_minus1: 119 (0x077)
10A0D52 frame_mbs_only_flag: Yes
10A0D52 direct_8x8_inference_flag: Yes
10A0D52 frame_cropping_flag (1 bytes)
10A0D52 frame_cropping_flag: Yes
10A0D52 frame_crop_left_offset: 0 (0x0)
10A0D53 frame_crop_right_offset: 4 (0x4)
10A0D53 frame_crop_top_offset: 0 (0x0)
10A0D53 frame_crop_bottom_offset: 0 (0x0)
10A0D53 vui_parameters_present_flag (9 bytes)
10A0D53 vui_parameters_present_flag: Yes
10A0D53 aspect_ratio_info_present_flag: No
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+ 4
10A0D54 overscan_info_present_flag: No // 01
10A0D54 video_signal_type_present_flag (3 bytes)
10A0D54 video_signal_type_present_flag: Yes // 02
10A0D54 video_format: 5 (0x5) - (3 bits) - // 03, 04, 05
10A0D54 video_full_range_flag: 0 (0x0) - (1 bits) - Limited // 06
10A0D54 colour_description_present_flag (3 bytes)
10A0D54 colour_description_present_flag: Yes // 07
10A0D54 colour_primaries: 6 (0x06) - (8 bits) - BT.601 NTSC // 08, 09, 10, 11, 12, 13, 14, 15
10A0D55 transfer_characteristics: 6 (0x06) - (8 bits) - BT.601 // 16, 17, 18, 19, 20, 21, 22, 23
10A0D56 matrix_coefficients: 6 (0x06) - (8 bits) - BT.601 // 24, 25, 26, 27, 28, 29, 30, 31
10A0D57 chroma_loc_info_present_flag: No // 32
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Example 1: BT.601 NTSC
----------------------
video_full_range_flag
|
10A0D54 6A 0110 101,0 // the last bit is 0
10A0D55 0C 0000 110,0 0000 0110 -> 6 BT.601 NTSC
10A0D56 0C 0000 110,0 0000 0110 -> 6 BT.601
10A0D57 0C 0000 110,0 0000 0110 -> 6 BT.601
Example 2: BT.601 PAL
----------------------
10A0D54 6A 0110 101,0 // the last bit is 0
10A0D55 0A 0000 101,0 0000 0101 -> 5 BT.601 PAL
10A0D56 0C 0000 110,0 0000 0110 -> 6 BT.601
10A0D57 0C 0000 110,0 0000 0110 -> 6 BT.601
Example 3: BT.709
----------------------
10A0D54 6A 0110 101,0 // the last bit is 0
10A0D55 02 0000 001,0 0000 0001 -> 1 BT.709
10A0D56 02 0000 001,0 0000 0001 -> 1 BT.709
10A0D57 02 0000 001,0 0000 0001 -> 1 BT.709
------- + 4 10A0D69 Header (8 bytes) 10A0D69 Size: 19 (0x00000013) ------- + 4 10A0D6D Name: colr ------- + 4 10A0D71 Color parameter type: nclx ------- + 2 10A0D75 Primaries index: 0 (0x0000) - ------- + 2 10A0D77 Transfer function index: 6 (0x0006) - BT.601 ------- + 2 10A0D79 Matrix index: 0 (0x0000) - Identity ------- + 1 10A0D7B full_range_flag: No ------- 10A0D7C BitRate (20 bytes) 10A0D7C Header (8 bytes) 10A0D7C Size: 20 (0x00000014) 10A0D80 Name: btrt 10A0D84 bufferSizeDB: 0 (0x00000000) 10A0D88 maxBitrate: 12977087 (0x00C603BF) 10A0D8C avgBitrate: 12977087 (0x00C603BF)
Use ffmpeg to modify colour_description in vui_parameters to BT.709
- H.264
ffmpeg -y -i in.mp4 -map 0 -c copy -map_metadata 0 -bsf:v h264_metadata=colour_primaries=1:transfer_characteristics=1:matrix_coefficients=1 out.mp4
- H.265
ffmpeg -y -i in.mp4 -map 0 -c copy -map_metadata 0 -bsf:v hevc_metadata=colour_primaries=1:transfer_characteristics=1:matrix_coefficients=1 out.mp4
Use mediainfo to find the position of colr box in the mp4 file
mediainfo out2.mp4 --Details=1 | grep -iE -15 "colr|vui"
Use ghex to modify colr box in the mp4 file
Note: every index occupied 2 bytes
ISO definitions
| colour_description | colour_primaries | transfer_characteristics | matrix_coefficients |
|---|---|---|---|
BT.601 PAL (625-line) |
5 |
6 |
6 |
BT.601 NTSC (525-line) |
6 |
6 |
6 |
BT.709 |
1 |
1 |
1 |
-
NTSC = SMPTE 170M = BT 601 525 -
PAL = BT 470 BG = BT 601 625