GET_OPTIONS (-get):

icc

Get ICC profile.

exif

Get EXIF metadata.

xmp

Get XMP metadata.

frame n

Get nth frame from an animated image. (n = 0 has a special meaning: last frame).

SET_OPTIONS (-set)

loop loop_count

Set loop count on an animated file.

Where: 'loop_count' must be in range [0, 65535].

bgcolor A,R,G,B

Set the background color of the canvas on an animated file.

where: 'A', 'R', 'G' and 'B' are integers in the range 0 to 255 specifying the Alpha, Red, Green and Blue component values respectively.

icc file.icc

Set ICC profile.

Where: 'file.icc' contains the ICC profile to be set.

exif file.exif

Set EXIF metadata.

Where: 'file.exif' contains the EXIF metadata to be set.

xmp file.xmp

Set XMP metadata.

Where: 'file.xmp' contains the XMP metadata to be set.

STRIP_OPTIONS (-strip)

icc

Strip ICC profile.

exif

Strip EXIF metadata.

xmp

Strip XMP metadata.

DURATION_OPTIONS (-duration)

Amend the duration of a specific interval of frames. This option is only effective on animated WebP and has no effect on a single-frame file.

duration[,start[,end]]

Where:
duration is the duration for the interval in milliseconds (mandatory). Must be non-negative.
start is the starting frame index of the interval (optional).
end is the ending frame index (inclusive) of the interval (optional).

The three typical usages of this option are:

-duration d
set the duration to 'd' for the whole animation.
-duration d,f
set the duration of frame 'f' to 'd'.
-duration d,start,end
set the duration to 'd' for the whole [start,end] interval.

Note that the frames outside of the [start, end] interval will remain untouched. The 'end' value '0' has the special meaning 'last frame of the animation'.

Reminder:

frame indexing starts at '1'.

FRAME_OPTIONS (-frame)

Create an animated WebP file from multiple (non-animated) WebP images.

file_i +di[+xi+yi[+mi[bi]]]

Where: 'file_i' is the i'th frame (WebP format), 'xi','yi' specify the image offset for this frame, 'di' is the pause duration before next frame, 'mi' is the dispose method for this frame (0 for NONE or 1 for BACKGROUND) and 'bi' is the blending method for this frame (+b for BLEND or -b for NO_BLEND). Argument 'bi' can be omitted and will default to +b (BLEND). Also, 'mi' can be omitted if 'bi' is omitted and will default to 0 (NONE). Finally, if 'mi' and 'bi' are omitted then 'xi' and 'yi' can be omitted and will default to +0+0.

-loop n

Loop the frames n number of times. 0 indicates the frames should loop forever. Valid range is 0 to 65535 [Default: 0 (infinite)].

-bgcolor A,R,G,B

Background color of the canvas.
where: 'A', 'R', 'G' and 'B' are integers in the range 0 to 255 specifying the Alpha, Red, Green and Blue component values respectively [Default: 255,255,255,255].

INPUT

Input file in WebP format.

OUTPUT (-o)

Output file in WebP format.

Note:

The nature of EXIF, XMP and ICC data is not checked and is assumed to be valid.