(Note: I used to be employed by Mozilla, and in that capacity I was the owner of Mozilla's image decoders. I've been disconnected from all decisions for almost a year, though.)

The main take-home here is that while Google's numbers all show WebP as being objectively better, the metrics they chose for comparison were relatively bad (i.e., some of them didn't take into account colour or didn't model colour correctly), and once you accounted for that the numbers were not nearly as good a story for WebP; in some cases, JPEG outperformed it.

The facts that (1) WebP was not terribly compelling technically, (2) JPEG is already supported by everything on the web, not to mention devices and mobile phones etc, and (3) there's still headroom to improve JPEG in a backwards-compatible way, meant that WebP was (and, it seems, remains) a non-starter.

cromwellian

But is there headroom for JPEG to replace animated gifs? If I look at mobile social apps these days, animated GIFs eat up enormous amounts of data. JPEG doesn't seem to have an answer for this, and no one has yet, it appears, made the element work for this use case.

rasz_pl

you can use javascript mpeg1 decoder instead of \nyou get auto playing animated mpeg files instead of gif\nmpeg is pretty much jpeg stream with bonus I frames

https://github.com/phoboslab/jsmpeg

example:

http://phoboslab.org/log/2013/05/mpeg1-video-decoder-in-java...