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Animated WebP doesn't play smoothly on iPhone!





Animated WebP doesn't play smoothly on iPhone!

Animated WebP files are displayed nicely on Chrome browsers and Android mobile phones. The same files sometimes, however, do not play smoothly on iPhone. WebPs made by Honycam old versions (up to v3.37) also have the same problem.

Using the latest Honeycam, you can make animated WebP files with no problem on iPhone.

Just check the option [Make compatible with iPhone] on WebP settings in Honeycam Settings (Hotkey: F5). Actually, this option is default setting so you don't have touch anything. In case, your Honeycam doesn't show this option, please update Honeycam to the latest version.

As long as the [compatible with iPhone] option is turned on, just save images as you did. You'll have an animated WebP without any problem on iPhone.

However, the WebP file size could go bigger if you turn this option on.

It is because iPhone's WebP decoder has some problems handling some inter-frame decoding methods, which is called frame disposal. Frame disposal has been used since animated GIF. The method, in short, devides images into small blocks and compare them with the previous image. If the block is very simliar to the that of the previous image, then that block doesn't have to be saved and is just marked as "use the block of the previous image".

If the images are varying only on some part, frame disposal method can save lots of bytes. Unfortunately, iPhone's WebP decoder does NOT support this method properly, so animated WebPs with frame disposal method are not shown properly.
iPhone compatible (480 KB)
Without iPhone compatible (463 KB)

The file sizes of two animated WebP images above do not show much difference because all areas of images are constantly changing.

However, the samples below in which images only changes in small areas, the difference of the file sizes goes big.
iPhone compatible (887 KB)
Without iPhone compatible (185 KB)

Please download Honeycam free edition and try right now.

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