.IVF

Introduction

IVF is a very simple file for a single stream of compressed video, written by the reference encoders of the VP8, VP9 and AV1 codecs. It wraps each frame with its size and timestamp and nothing more: there is no audio and no index. IVF files are used to test encoders and decoders and to exchange raw VP8, VP9 and AV1 streams.

Structure

The file starts with a 32-byte header. All numbers are little-endian. The header holds the signature DKIF, a 16-bit version (0), the 16-bit header length (32), a four-character codec code such as VP80, VP90 or AV01, the width and height in pixels, the time base as two 32-bit numbers, and the number of frames.

Each frame follows with a 12-byte frame header, a 32-bit frame size and a 64-bit timestamp in time base units, then the frame data.

Links