I have an AVI file, is there some free software I can use to add chapters and menu?
I don't believe AVI supports menus and chapters. Your best best is to convert the AVI to DVD format. SUPER will do this for you and is freeware. However, you will need additional software to insert menus and chapters. The easiest way I know of doing this is with CONVETXTODVD. It is not free and costs about ?35. Hopefully, somneone else can advise you of any other free options.
Note - If the MKV file you have is HD and you want retain the HD format , your best best would be to use MULTIAVCHD. It takes a bit of learning but it will give you everything you want (menus/chapters/audio and sub title streams) abd it is also free.
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