Find FAQ: How to on ipad

How to convert AVI to MP4? --
I downloaded some video files with AVI format. but it is not compatible with iPad 4 ,so how can i convert the AVI form to MP4 ?
How to convert mkv to ipad? --
How to convert MKV to iPad to play MKV video on iPad?
Usually i like to collect some classic dvd movie disks so that i can watch again on my house dvd player when i am free.but recently i got an ipad 4 from amazon online store.I really watch dvd movie on my pad whenever i want.However,this seems not so easy. Please give me a hand and would be grateful.
See above question.  What profram and what are the steps to load a dvd to my iPad Air
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How to on ipad