How to convert videos for phillips gogear.

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THe link- http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?scy=US&slg=AEN&sct=PORTABLE_VIDEO_PLAYERS_SU&cat=MP3_AND_MEDIA_PLAYERS_CA&session=20120612132123_117.195.128.163&grp=SOUND_AND_VISION_GR&ctn=SA1OPS08K/37&mid=Link_Software&hlt=Link_Software