OSType（也称作FourCC或ResType）通常作为一种4字节的类别标示名被使用在Mac OS里。虽然它们通常是来自ASCII码或Mac OS Roman字符集，但是4个字节原则上可以是任何二进制值。
外部链接
- FourCC.org（页面存档备份，存于互联网档案馆） -- 视频Codec和像素格式信息
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