MPEG4 AVC标头大小? [英] MPEG4 AVC header size?

问题描述

一个问题:.mp4文件头的字节大小是多少?

Just one question : what is the size in bytes of the header of a .mp4 file ?

目标是仅模糊此标头.

谢谢 卡尔

推荐答案

这要视情况而定. ISO媒体容器格式(.mp4)使用称为 atoms 的元素构成.它取决于音轨的数量，H.264编码属性，复用器还喜欢将其名称放在文件中的free原子中.

It depends. ISO media container format (.mp4) uses a strusture of elements called atoms. It depends on the number of tracks, the H.264 encoding properties, the muxers also like to put their names in the file in a free atom.

期望它至少为1 KB.超过4k的可能性很小.

Expect it to be at least 1 kByte. Anything over 4k is not very likely.

如果遇到字符串mdat(电影数据原子的标题)，则文件标题会可能结束.

If you encounter the string mdat (header of the movie data atom), the file header is probably over.

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