As what you said, you need to put your video generated from your camcorder to iPhone 4. In this case, what you need is a camera video to iphone 4 converter. As for the converter, i recommend Aunsoft mts to iphone 4 converter.
This MTS to iPhone 4 Video Converter is a powerful video converter for iPhone 4 users to convert video files like VOB to iPhone 4 videos. Besides converting VOB to iPhone 4, this iPhone 4 video converter also supports converting AVI, MTS, AVCHD, M2TS, DivX, XviD, MPEG, MKV, WMV, MOV, RM, MP4, etc. videos to iPhone 4 MPEG 4 (*.MP4) or iPhone 4 H.264 (*.MP4) videos.
The iPhone 4 conversion tips :
http://www.aunsoft.com/iphone4/