How to convert mp4 video to any file format withouth app by your android...

Dost, Is video me mai aap logo ko bataunga ki hum bina kisi android application ke...Ek mp4 video ko kisi anya file format jaise mp3, jpg, pdf etc. me kaise convert karte hai...Dosto, ye sara kaam hum direct apne android mobile se kar sakte hai.....Iske liye hume kisi third party application ki jaroorat nhi hai....