The present application relates to a method for editing and broadcasting compressed multimedia files composed of binary data blocks originating from digital transformations applied to an audiovisual or multimedia content according to the format of a parent file, said parent file having been separated into a first modified file having the format of the nominal parent file and into a complementary file including information on the modifications brought to the parent file, the method comprising prior to the transmission from a portal to the receiving terminal: a step of preparation including analyzing said first file for extracting time-codes therefrom, a second step including generating an index register table from said first modified file, a third step including generating a modified multimedia file according to the format of the parent file containing information of said first modified file and meta-data, a step of transmission of said modified multimedia file separate from said modified multimedia file, the elements of said complementary file making it possible to recreate a partial synthesis of the original audiovisual file.