img2webp

Name

img2webp -- Create animated WebP file from a sequence of input images.

Synopsis

img2webp [file_level_options] [files] [per_frame_options...]
img2webp argument_file_name

Description

img2webp compresses a sequence of images using the animated WebP format. Input images can either be PNG, JPEG, TIFF or WebP. If a single file name (not starting with the character '-') is supplied as the argument, the command line argument are actually tokenized from this file. This allows for easy scripting or using large number of arguments.

File-level Options

The file-level options are applied at the beginning of the compression process, before the input frames are read.

-o string
Specify the name of the output WebP file.
-min_size
Encode images to achieve smallest size. This disables key frame insertion and picks the parameters resulting in smallest output for each frame. It uses lossless compression by default, but can be combined with -q, -m, -lossy or -mixed options.
-kmin int
-kmax int
Specify the minimum and maximum distance between consecutive key frames (independently decodable frames) in the output animation. The tool will insert some key frames into the output animation as needed so that this criteria is satisfied.
-mixed
Mixed compression mode: optimize compression of the image by picking either lossy or lossless compression for each frame heuristically. This global option disables the local option -lossy and -lossless.
-loop int
Specifies the number of times the animation should loop. Using 0 means 'loop indefinitely'.
-v
Be more verbose.
-h, -help
A short usage summary.
-version
Print the version numbers of the relevant libraries used.

Per-frame Options

The per-frame options are applied for the images following as arguments in the command line. They can be modified any number of times preceding each particular input image.

-d int
Specify the image duration in milliseconds.
-lossless, -lossy
Compress the next image(s) using lossless or lossy compression mode. The default mode is lossless.
-q float
Specify the compression factor between 0 and 100. The default is 75.
-m int
Specify the compression method to use. This parameter controls the trade off between encoding speed and the compressed file size and quality. Possible values range from 0 to 6. Default value is 4.

Bugs

Example

img2webp -loop 2 in0.png -lossy in1.jpg -d 80 in2.tiff -o out.webp

Authors

img2webp is a part of libwebp and was written by the WebP team. The latest source tree is available at https://chromium.googlesource.com/webm/libwebp

This manual page was written by Pascal Massimino pascal.massimino@gmail.com for the Debian project (and may be used by others).