I have a few questions if I may:
Is WebP-mux already supported in some current browser? (Chrome Dev
Are there some content samples that demonstrate the various features?
Also, why is there a need to add an alpha channel in WebP-mux and as
part of the WebP codec?
Thanks in advance,
On Oct 3 2011, 6:10 pm, Vikas Arora <vik...@google.com> wrote:
> The initial launch of WebP focused on demonstrating a smaller file size.
> Since then we’ve clearly heard the community ask for more than just that - a
> full featured image codec that can serve as a true alternative for your
> needs on the web. Today we are happy to announce a framework for adding such
> features through a RIFF based container, WebP-Mux. A draft specification and
> initial implementation of the following features - Color profile, XMP
> metadata, Animation & Tiling - has been pushed to the chromium Git
> repository. Following are the detailed contents included in this push:
> - A working draft of the WebP-Mux container specification (defining RIFF
> chunks for these features) is provided in the 'docs/' folder.
> - WebP-Mux code library to create RIFF container object for implementing
> these features.
> - Color-profile & XMP Metadata are supported as in other popular image
> formats. The data for Color-profile & Metadata are represented
> as separate
> RIFF chunks and handled as transparent binary blob by the Mux library.
> Appropriate Mux API can be used to associate these to container
> corresponding to the VP8 (WebP) data image.
> - Animated images are supported as in other popular image formats like
> GIF. The individual animation frames along with intra-frame
> duration & LOOP
> control variable are represented as separate RIFF chunks. Appropriate Mux
> API can be used to construct the container by adding individual animation
> frames. The corresponding animation player (browser or any other
> client App)
> needs to extract individual animation frames and adhere to the
> duration & LOOP semantics.
> - Tiling: A single VP8 data-frame has an inherent limitation for width
> or height of 2^14 pixels and a 512kB limit on the size of first
> partition. To support larger images, we support images that are
> composed of
> multiple tiles, each encoded as a separate VP8 frame. All tiles logically
> represent a single image and they have common metadata, color profile etc.
> - README.mux file containing reference pseudo-code example for using
> WebP-Mux library.
> - A reference command line tool ('examples/webpmux') for manipulating the
One more question related to the Android support of WebP. (I'm not
sure it is the right forum to ask, but I'll ask anyway :) )
Will future WebP versions be backported to Android browser that
currently support WebP, such as Android 4.0?
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