Find FAQ: How can I sync videos to my mp3 player?

I got a new mp3 player recently, which features like camera, video, and music. How can I download videos so I can sync to my mp3 player? Or are there any websites allowing me to download/buy videos sync to my mp3 player? I tried iTunes but it didn't work. Can you help me, please!!!
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How can I sync videos to my mp3 player?