Hi, I'm very new to iPhone development. Can any shed any light on how (in broad terms) can video sharing be implemented in an iphone app? Specifics I'll figure out, I need to understand the logic. Taking a look at "Talking Tom" application - Outfit7 implements it very well, I'm just not sure how. Their app can save MP4 in Pictures (to send via MMS), attach to e-mail, upload to Youtube, etc. And none of it is done via uploading to some server and sending out a link. They also don't just add a sound track to an exciting mp4 - it seems they are able to render MP4 on the fly. How? If anyone can outlining the logic, it would be a great help, Thanks!