Ubuntu Manpage: img2webp - create animated WebP file from a sequence of input images.

NAME

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

SYNOPSIS

       img2webp [file_options] [[frame_options] frame_file]... [-o webp_file]
       img2webp argument_file_name

DESCRIPTION

       This manual page documents the img2webp command.

       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 arguments are actually  tokenized  from  this  file.   This  allows  for  easy
       scripting or using a 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 the 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 .

-near_lossless int
Specify the level of near-lossless image preprocessing. This option adjusts pixel values to help
compressibility, but has minimal impact on the visual quality. It triggers lossless compression
mode automatically. The range is 0 (maximum preprocessing) to 100 (no preprocessing, the default).
The typical value is around 60. Note that lossy with -q 100 can at times yield better results.

-sharp_yuv
Use more accurate and sharper RGB->YUV conversion if needed. Note that this process is slower than
the default 'fast' RGB->YUV conversion.

-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.

EXAMPLE

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

BUGS

       Please report all bugs to the issue tracker: https://bugs.chromium.org/p/webp
       Patches          welcome!          See          this         page         to         get         started:
       https://www.webmproject.org/code/contribute/submitting-patches/

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).