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IVF is a simple file format that transports raw VP8 data.

Multi-byte numbers of little-endian. An IVF file begins with a 32-byte header:

bytes 0-3 signature: 'DKIF' bytes 4-5 version (should be 0) bytes 6-7 length of the header in bytes bytes 8-11 codec FourCC (e.g., 'VP80') bytes 12-13 width in pixels bytes 14-15 height in pixels bytes 16-23 time base denominator bytes 20-23 time base numerator bytes 24-27 number of frames in a file bytes 28-31 unused

The header is followed by a series of frames. Each frame consists of a 12-byte header followed by data:

bytes 0-3 size of the frame in bytes (not including the 12-byte header) bytes 4-11 64-bit presentation timestamp bytes 12.. frame data