How do the new lossy video formats work for looped videos? It looks like gifv has been accepted by r/perfectLoops...[1] Do HEVC etc require the last frame of a

How do the new lossy video formats work for looped videos? It looks like gifv has been accepted by r/perfectLoops...[1] Do HEVC etc require the last frame of a video to be a keyframe? Are predicted frames specified at the same quality level as keyframes? [1] http://www.reddit.com/r/perfectLoops http://www.reddit.com/r/perfectLoops