how to play AVI videos on psp 2000

question : is there any way to play AVI videos on psp 2000 ?we must convert the video to change the file format.we can try to make install first "Youtube Downloader", there's tar, modifier of what format the video into a format which would ....we want to.convert it to change the type of files. on youtube there downloder ko make convert into PSP MP4 formatother solution is we can convert the video