frustrating : sync pic from ipad to iphone via itunes

at home i video capture my kid interesting moment with ipad (3rd gen os5), bacause my iphone (4rd gen os 5) on wall charging. the next step i want to do is move the raw video from ipad to my iphone, because i want to share it thru whatsapp messanger to my other family. so my usual task to do this is sync ipad to iphoto, that automatically show the recent video i captured on 'last import' smart album. i plug out the ipad then plug in the iphone, open itunes, on photo tab, i check the 'the last import' from iphoto album (on itunes photo tab section) to sync it on itunes. the progres bar show it copying the new video. then finish. the moment i see on iphone lock screen the notification that say the item cannot sync, see itunes for info. but i see nothing on itunes, the iphone still plug in my mac usb, and itunes. i try other route, copy the video file via iFunbox, but still no luck. i look it the file again, its mov extension. so i convert it to mp4, transfer via ifunbox thru app file sharing section, than open it in the app on my iphone, than add it on photo album. than yes, its right there on my photos app,...finally. but, what the....?? do i have to take this long, inefficient, time wasting route again?
I've been using iphone since i3g, ipad since first gen. and recent 2012 i switch from window pc to mac, because i believe (somehow) if use the same hardware, from apple phone to apple tablet complete it with the mac os computer would be perfect syncronising process on everyday task (simple basic task). is there any part of the process that i doing it wrong, please if there is. correct me, advise, or anything can help, will be a appreciated.