IVF格式

IVF是一个非常简单的视频容器。用于封装VP8/VP9的数据。

下面多字节的数据是采用小端编码(little-endian)。IVF文件头由32字节组成：

bytes 0-3    signature: 'DKIF'

bytes 4-5    version (should be 0)

bytes 6-7    length of header in bytes

bytes 8-11  codec FourCC (e.g., 'VP80')

bytes 12-13  width in pixels

bytes 14-15  height in pixels

bytes 16-19  frame rate

bytes 20-23  time scale

bytes 24-27  number of frames in file

bytes 28-31  unused

文件后跟随多帧的数据，第帧数据由一个12字节的帧头组成。

bytes 0-3    size of frame in bytes (not including the 12-byte header)

bytes 4-11  64-bit presentation timestamp

bytes 12..  frame data

参考：

1. https://wiki.multimedia.cx/index.php?title=IVF