What is the file signature for .F4V?

What is the hex signature for a .f4v file?

It is not listed in File Signatures Table nor could I find it in Adobe specs. Or am I misunderstanding something here? The purpose is to verify an 开发者_如何学Cuploaded file. Thanks.

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According to the mentioned specs, an F4V file is composed of boxes. There are a couple of dozens types of boxes. A box has a header that states its type and there is a different signature for each box type - these are described in the specs. Furthermore, the order in which the boxes go is not strictly specified. The specs state that

the "ftyp" box should be placed as early as possible

This type of box is required in a F4V file, but I wonder if one can trust it to always be the first one.

So I guess that there is no single signature code for the F4V file, but rather a couple dozens that might indicate an f4v, with ones occurring more often than others.

My conclusions are based on the adobe specifications http://download.macromedia.com/f4v/video_file_format_spec_v10_1.pdf

Thanks to www0z0k for pointing it out.