Until now, there was no way to edit a video that was uploaded to YouTube, without creating a new video file and URL. Yes, YouTube introduced an online video editor a while ago that lets users re-mix and mash-up their own and creative-commons videos. But all videos created in that editor got a brand new video page and URL.
But in fall 2011, YouTube introduced a new type of video editor that lets you make changes to videos on your account without changing the video URL. This is a great feature because you can update videos without having to worry about updating shared or embedded links.
You can find the new video editor at the top of any page playing one of your videos. Of course, you need to be logged in to your YouTube account and have uploaded videos for it to work.
