mp4 video player downloadI bought a sony walkman. and they have a mp4 video player. where can i download mp4 videos.?

All you need is a video converter, and then you can put any videos you've got on your mobmp4 video player downloadile. Try google and "free video converter", i have that i use for my PSP ( MPG4 ). Fmp4 video player downloador phones you can also use 3gp format. Hope i helped =)
You can , if you have MP4.