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I do scanning of file system and I need identify all 3gp files.
Usually, for noting that particular file is of certain format, developers of that format make marks.
E.g. first bytes of FLV are 46 4C 56 01, if it’s so, one can be sure that this is FLV format (if no one changed it intentionally, of course), etc.
I’d be glad to identify 3gp files in the same way, but which bytes do indicate that?
nnis14for 3GPP files and20for 3GPP2 ones.All hail Wikipedia.