YouTube adds slow-motion video effect feature

YouTube has slowly added effects and different things users can add to their videos, allowing them to edit them from within YouTube while retaining all the comments, URL, and such that are already applied to the video.
Today the video hosting service added a new feature to Enhancements – Slow Motion. Says the announcement, this feature allows users to slow down videos, giving the appearance they were filmed with a slo-mo camera.

Unlike some slow motion effects added by software, this YouTube effect is smooth, and results in a video that appears to have been recorded at about 120fps, with the exception being that it retains the audio (likewise slowing it down), while some consumer-level cameras won’t capture audio in slo-mo mode. Obviously, poorer quality videos won’t handle the effect as well as better quality ones, but
nonetheless it is very smooth.

source: slashgear