Core Development
The Audio Video Interleave (AVI) File Format
| Offset | Name | Definition | Size | Value | Hex Bytes |
|---|---|---|---|---|---|
| The RIFF Header | |||||
| 0 | RIFF ID | This contains the letters "RIFF" to indicate the main file format. | 4 | RIFF | 52 49 46 46 |
| 4 | Size | The remaining size in bytes: (file size - 8) bytes (little endian). | 4 | 388,192 | 60 ec 05 00 |
| 8 | Format | This is the format of the remainder, which is "AVI " in the case. | 4 | AVI_ | 41 56 49 20 |
| The Header List | |||||
| 12 | List ID | The letters "LIST" indicate a list portion. | 4 | LIST | 4C 49 53 54 |
| 16 | Length | This size of the header list. | 4 | 294 | 26 01 00 00 |
| 20 | Header ID | The letters "hdrl" indicate that this is a header list. | 4 | hdrl | 68 64 73 6C |
| The AVI Header | |||||
| 24 | AVI Header ID | The letters "avih" identify this as the AVI header. | 4 | avih | 61 76 69 68 |
| 28 | Length | The size of the AVI header: 56 bytes = 14 * 4 bytes | 4 | 56 | 38 00 00 00 |
| AVI Main Header (MainAVIHeader) | |||||
| 32 | μsecs Per Frame | The length of time for each frame in microseconds. | 4 | 1,000,000 | 40 42 0f 00 |
| 36 | Max Byte Rate | The maximum number of bytes per second. | 4 | 133,400 | 18 09 02 00 |
| 40 | Reserved 1 | Reserved | 4 | 0 | 00 00 00 00 |
| 44 | Flags | Flags: AVIF_HASINDEX, AVIF_MUSTUSEINDEX, AVIF_ISINTERLEAVED, AVIF_WASCAPTUREFILE, AVIF_COPYRIGHTED | 4 | 2064 | 10 08 00 00 |
| 48 | Total Frames | The total number of frames of data in the file. | 4 | 5 | 05 00 00 00 |
| 52 | Initial Frame | This specifies the initial frame. Noninterleaved files should use 0. | 4 | 0 | 00 00 00 00 |
| 56 | Streams | This specifies numbers of streams, usually 2 for video and sound. | 4 | 2 | 02 00 00 00 |
| 60 | Buffer Size | This specifies suggest buffer size. | 4 | 160,000 | 00 71 02 00 |
| 64 | Width | This specifies width in pixels. | 4 | 150 | 96 00 00 00 |
| 68 | Height | This specifies height in pixels. | 4 | 100 | 64 00 00 00 |
| 72 | Reserved | This is reserved. It should be zero. | 16 | 0 | 00 ... 00 |
| The Video Stream List | |||||
| 88 | List ID | The letters "LIST" indicate a list portion. | 4 | LIST | 4C 49 53 54 |
| 92 | Length | This size of the list. | 4 | 116 | 74 00 00 00 |
| 96 | Stream List | The letters "strl" indicate that this is a stream list. | 4 | strl | 73 74 72 6c |
| 100 | Stream Header | The letters "strh" indicate that this is a stream header. | 4 | strh | 73 74 72 68 |
| 104 | Length | This size of the header. | 4 | 56 | 38 00 00 00 |
| The AVI Video Stream Header (AVIStreamHeader) | |||||
| 108 | Type | This is the header type. It is "vids" for video. | 4 | vids | 76 69 64 73 |
| 112 | Handler | Optionally, contains a FOURCC for a specific data handler. | 4 | 0 | 00 00 00 00 |
| 116 | Flags | Flags: AVISF_DISABLED, AVISF_VIDEO_PALCHANGES | 4 | 0 | 00 00 00 00 |
| 120 | Priority | The priority of the stream. | 4 | 0 | 00 00 00 00 |
| 124 | Initial Frames | This specifies how far ahead the audio compared to the video. | 4 | 0 | 00 00 00 00 |
| 128 | Scale | This specifies the time scale that this stream will use. | 4 | 1000 | e8 03 00 00 |
| 132 | Rate | Rate/Scale = samples per second | 4 | 1000 | e8 03 00 00 |
| 136 | Start | The start time, usually zero. | 4 | 0 | 00 00 00 00 |
| 140 | Length | The length of the video. | 4 | 5 | 05 00 00 00 |
| 144 | Buffer Size | This should be larger than the largest chunk, zero if unknown. | 4 | 2960 | 90 b0 00 00 |
| 148 | Quality | A value between 0 and 10,000. | 4 | 0 | 00 00 00 00 |
| 152 | Sample Size | The size of a sample; zero if varying, block align for audio. | 4 | 0 | 00 00 00 00 |
| 156 | Frame | The left, top, right, bottom coordinates in 16 bit values. | 8 | 0, 0 150, 100 |
00 00 00 00 96 00 64 00 |
| 164 | Stream Format | The letters "strf" indicate that this is a stream format. | 4 | strf | 73 74 72 66 |
| 168 | Length | This size of the format. | 4 | 40 | 28 00 00 00 |
| The AVI Video Stream Format (BITMAPINFOHEADER) | |||||
| 172 | Size | This is size of BITMAPINFOHEADER. | 4 | 40 | 28 00 00 00 |
| 176 | Width | The width of the bitmap in pixels. | 4 | 150 | 96 00 00 00 |
| 180 | Height | The height of the bitmap in pixels. | 4 | 100 | 64 00 00 00 |
| 184 | Planes | The planes of the target device, must be 1. | 2 | 1 | 01 00 |
| 186 | Bit Count | The number of bits per pixels. | 2 | 24 | 18 00 |
| 188 | Compression | Values: BI_RGB, BI_RLE8, BI_RLE4, BI_BITFIELDS, BI_JPEG, BI_PNG | 4 | 0 | 00 00 00 00 |
| 192 | Image Size | The size of the image in bytes, may be zero for BI_RGB. | 4 | 45,200 | 90 b0 00 00 |
| 196 | X Pels Per Meter | The horizontal pixels per meter. | 4 | 0 | 00 00 00 00 |
| 200 | Y Pels Per Meter | The vertical pixels per meter. | 4 | 0 | 00 00 00 00 |
| 204 | Colors Used | The number of colors used, zero if all colors are used. | 4 | 0 | 00 00 00 00 |
| 208 | Colors Important | The number of colors required, zero if all colors are requuired. | 4 | 0 | 00 00 00 00 |
| The Audio Stream List | |||||
| 212 | List ID | The letters "LIST" indicate a list portion. | 4 | LIST | 4C 49 53 54 |
| 216 | Length | This size of the list. | 4 | 94 | 5e 00 00 00 |
| 220 | Stream List | The letters "strl" indicate that this is a stream list. | 4 | strl | 73 74 72 6c |
| 224 | Stream Header | The letters "strh" indicate that this is a stream header. | 4 | strh | 73 74 72 68 |
| 228 | Length | This size of the header. | 4 | 56 | 38 00 00 00 |
| The AVI Audio Stream Header (AVIStreamHeader) | |||||
| 232 | Type | This is the header type. It is "auds" for video. | 4 | auds | 61 75 64 73 |
| 236 | Handler | Optionally, contains a FOURCC for a specific data handler. | 4 | 0 | 00 00 00 00 |
| 240 | Flags | Flags: AVISF_DISABLED, AVISF_VIDEO_PALCHANGES | 4 | 0 | 00 00 00 00 |
| 244 | Priority | The priority of the stream. | 4 | 0 | 00 00 00 00 |
| 248 | Initial Frames | This specifies how far ahead the audio compared to the video. | 4 | 0 | 00 00 00 00 |
| 252 | Scale | This specifies the time scale that this stream will use. | 4 | 2 | 02 00 00 00 |
| 256 | Rate | Rate/Scale = samples per second | 4 | 88,200 | 88 58 01 00 |
| 260 | Start | The start time, usually zero. | 4 | 0 | 00 00 00 00 |
| 264 | Length | The length of the video. | 4 | 80,000 | 80 38 01 00 |
| 268 | Buffer Size | This should be larger than the largest chunk, zero if unknown. | 4 | 160,000 | 00 71 02 00 |
| 272 | Quality | A value between 0 and 10,000. Use -1 for default. | 4 | -1 | ff ff ff ff |
| 276 | Sample Size | The size of a sample; zero if varying, block align for audio. | 4 | 2 | 02 00 00 00 |
| 280 | Frame | The left, top, right, bottom coordinates in 16 bit values. | 8 | 0, 0 0, 0 |
00 00 00 00 00 00 00 00 |
| 288 | Stream Format | The letters "strf" indicate that this is a stream format. | 4 | strf | 73 74 72 66 |
| 292 | Length | This size of the format. | 4 | 18 | 12 00 00 00 |
| The AVI Audio Stream Format (WAVEFORMATEX) | |||||
| 296 | Sample Size | The size of a sample; zero if varying, block align for audio. | 2 | 1 | 01 00 |
| 298 | Channels | The number of channels of audio data. | 2 | 1 | 01 00 |
| 300 | Samples Per Sec | The number of samples per second. | 4 | 44,100 | 44 ac 00 00 |
| 304 | Ave Bytes Per Sec | (Samples Per Sec)*(Block Align) | 4 | 88,200 | 88 58 01 00 |
| 308 | Block Align | (Channels × BitsPerSample) / 8 | 2 | 2 | 02 00 |
| 310 | Bits Per Sample | This should be 8 or 16 for PCM. | 2 | 16 | 10 00 |
| 312 | Size Extra | The size of the extra information. | 2 | 0 | 00 00 |
| 314 | Junk | Begins with the label "JUNK" | 1722 | JUNK 1714 |
4a 55 4e 4b b2 06 ... |
| The Stream Data List | |||||
| 2036 | List ID | The letters "LIST" indicate a list portion. | 4 | LIST | 4C 49 53 54 |
| 2040 | Size | The size of the list. | 4 | 386,052 | 04 e4 05 00 |
| 2044 | Video Tag | The letters "movi" indicate a video image. | 4 | movi | 6d 6f 76 69 |
| 2048 | Data Type | Use "##db" uncompressed DIB, "##dc" for compressed. | 4 | 00db | 30 30 64 62 |
| 2052 | Image Size | The size of this image. | 4 | 45,200 | 90 b0 00 00 |
| 2056 | Pixel Data | The pixels of the image. | 45,200 | ? | ... |
| 47,256 | More Images | More Images: 45,208 bytes each. 4 more in this case | 180832 | ? | ... |
| 228,088 | Data Type | Use "##wb" for wave bytes (audio). | 4 | 01wb | 30 31 77 62 |
| 228,092 | Audio Size | The size of this image. | 4 | 160,000 | 00 71 02 00 |
| 228,096 | Audio Data | The sound wave data. | 160,000 | ? | ... |
| The Index List (Optional) | |||||
| 388,096 | Index ID | The letters "idx1" indicates an index portion. | 4 | idx1 | 69 64 78 31 |
| 388,100 | Index Size | The size of the index in bytes. | 4 | 96 | 60 00 00 00 |
| 388,104 | Chunk ID | The ID for the chunk of data. | 4 | 00db | 30 30 64 62 |
| 388,108 | Flags | The flags for this chuck. | 4 | 16 | 10 00 00 00 |
| 388,112 | Chunk Offset | The chunk offset, absolute or relative. | 4 | 4 | 04 00 00 00 |
| 388,116 | Chunk Size | The chunk size in bytes. | 4 | 45,200 | 90 b0 00 00 |
| 388,120 | More Chunks | There are four more image chunks. Offsets listed. | 64 | 45,212 90,420 135,628 180,836 |
9c b0 00 00 34 61 01 00 cc 11 02 00 64 c2 02 00 |
| 388,184 | Chunk ID | The ID for the chunk of data. | 4 | 01wb | 30 31 77 62 |
| 388,188 | Flags | The flags for this chuck. | 4 | 16 | 10 00 00 00 |
| 388,192 | Chunk Offset | The chunk offset, absolute or relative. | 4 | 226,044 | fc 72 03 00 |
| 388,196 | Chunk Size | The chunk size in bytes. | 4 | 160,000 | 00 71 02 00 |
| 388,200 | Size | The size of the next chunk in bytes. | 4 | 56 | 38 00 00 00 |
| 388,204 | ID | This is the header type. It is "vids" for video. | 4 | vids | 76 69 64 73 |
| 388,208 | The Rest | The rest is the same as the prior image spec. | 52 | ? | ? |
| 388,260 | List | The letters "LIST" indicate a list portion. | 4 | LIST | 4c 49 53 54 |
| 388,264 | Length | This size of the list. | 4 | 94 | 5e 00 00 00 |
| 388,268 | Stream List | The letters "strl" indicate that this is a stream list. | 4 | strl | 73 74 72 6c |
| 388,272 | Stream Header | The letters "strh" indicate that this is a stream header. | 4 | strh | 73 74 72 68 |
| 388,276 | Length | This size of the next portion. | 4 | 56 | 38 00 00 00 |
| 388,280 | Type | This is the header type. It is "auds" for audio. | 4 | auds | 61 75 64 73 |
| 388,284 | The Rest | The rest is the same as the prior audio spec. | 52 | ? | ? |
| 388,336 | Junk | Begins with the label "JUNK" to indicate junk data. This is just a repeat, but the size isn't correct. | 200 | JUNK 1714 |
4a 55 4e 4b b2 06 ... |
© 2007–2025 XoaX.net LLC. All rights reserved.