Not just from a URL on the web, but also from a local video file in the camera roll?
This! This please!
Also if you do this please have a "select all frames" button as well instead of having to manually select them all.
Also allow batch actions like rotate, crop, and reposition.
Similar request for batch action on frames: http://giffer.uservoice.com/forums/152157-support-and-feature-requests/suggestions/3426209-add-gif-crop-where-every-photo-in-the-gif-is-cropp
PS: I'm not sure if I'm helping when I point out duplicates.. I want to help, but if it's annoying I'll stop!