flv

https://zhuanlan.zhihu.com/p/503722834

https://blog.csdn.net/zranxi/article/details/122866828

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FLV 由 FLV header 跟 FLV file body 两部分组成，而 FLV file body 又由多个 FLV tag组成，FLV tag由 tag header + tag body组成。

FLV = FLV header + FLV body
FLV body = PreviousTagSize0 + Tag1 + PreviousTagSize1 + Tag2 + … + PreviousTagSizeN-1 + TagN
Tag1 = Tag1 header + Tag1 body