I'm currently exploring ideas around dynamic spatial media fragments and their representation in Media Fragments URI for highlighting moving targets in Web video.
I have had a first stab at dynamic spatial media fragments and managed to hack
together a live demo.
Let it load and play the video, after roughly 10s you should see
something (watch the upper left corner and look at the yellow
highlight div). The video's URL
contains a temporal media fragment t=0,50 and a dynamic spatial media
fragment xywh=0,0,10,10,20,50,120,150,120,40,180,90,200,200,100,100,300,100,90,200
(note, this is my freestyle extension of the current xywh spatial dimension naming standard).
As you can see, a comma-separated list of quadruples
marks the moving xywh's "keyframes". The browser takes care of the
smooth interpolations from keyframe to keyframe via auto-generated
CSS transitions.
Be sure to inspect
the DOM tree and look at the auto-generated style element and watch
the classes dynamically change on the highlight div. Freezing and
unfreezing the state works perfectly fine (play→pause→play), but there
are still some issues with seeking. I'm trying to fix those in the
next couple of days. Looking forward to any feedback you may have.
