> http://ernestdelgado.com/public-tests/gifoncanvas/

Kinda:

> if we add an animated GIF as the first source, every time a drawImage call happens it will render whatever the status of the GIF is at that very second

So if you call drawImage in a (timeout/setinterval) loop, you can get the frame's data, compare to the previous frame's data and if they're different you got a new frame-worth of data.

Considering that requires canvas support (with image-query capabilities) you're probably better off using websockets and the like.

I was thinking about doing something like that as well. To not send real images but some binary data. Dunno if it will work