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libsdl2_image/external/libwebp-1.0.2/man/webpmux.1
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.\" Hey, EMACS: -*- nroff -*-
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.TH WEBPMUX 1 "April 23, 2018"
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.SH NAME
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webpmux \- create animated WebP files from non\-animated WebP images, extract
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frames from animated WebP images, and manage XMP/EXIF metadata and ICC profile.
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.SH SYNOPSIS
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.B webpmux \-get
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.I GET_OPTIONS
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.I INPUT
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.B \-o
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.I OUTPUT
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.br
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.B webpmux \-set
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.I SET_OPTIONS
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.I INPUT
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.B \-o
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.I OUTPUT
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.br
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.B webpmux \-strip
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.I STRIP_OPTIONS
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.I INPUT
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.B \-o
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.I OUTPUT
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.br
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.B webpmux \-frame
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.I FRAME_OPTIONS
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.B [ \-frame ... ] [ \-loop
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.I LOOP_COUNT
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.B ]
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.br
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.RS 8
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.B [ \-bgcolor
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.I BACKGROUND_COLOR
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.B ] \-o
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.I OUTPUT
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.RE
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.br
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.B webpmux \-duration
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.I DURATION OPTIONS
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.B [ \-duration ... ]
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.I INPUT
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.B \-o
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.I OUTPUT
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.br
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.B webpmux \-info
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.I INPUT
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.br
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.B webpmux [\-h|\-help]
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.br
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.B webpmux \-version
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.br
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.B webpmux argument_file_name
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.SH DESCRIPTION
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This manual page documents the
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.B webpmux
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command.
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.PP
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\fBwebpmux\fP can be used to create/extract from animated WebP files, as well as
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to add/extract/strip XMP/EXIF metadata and ICC profile.
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If a single file name (not starting with the character '\-') is supplied as
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the argument, the command line arguments are actually tokenized from this file.
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This allows for easy scripting or using large number of arguments.
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.SH OPTIONS
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.SS GET_OPTIONS (\-get):
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.TP
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.B icc
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Get ICC profile.
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.TP
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.B exif
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Get EXIF metadata.
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.TP
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.B xmp
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Get XMP metadata.
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.TP
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.BI frame " n
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Get nth frame from an animated image. (n = 0 has a special meaning: last frame).
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.SS SET_OPTIONS (\-set)
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.TP
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.BI icc " file.icc
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Set ICC profile.
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.P
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Where: 'file.icc' contains the ICC profile to be set.
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.TP
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.BI exif " file.exif
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Set EXIF metadata.
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.P
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Where: 'file.exif' contains the EXIF metadata to be set.
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.TP
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.BI xmp " file.xmp
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Set XMP metadata.
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.P
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Where: 'file.xmp' contains the XMP metadata to be set.
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.SS STRIP_OPTIONS (\-strip)
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.TP
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.B icc
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Strip ICC profile.
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.TP
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.B exif
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Strip EXIF metadata.
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.TP
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.B xmp
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Strip XMP metadata.
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.SS DURATION_OPTIONS (\-duration)
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Amend the duration of a specific interval of frames. This option is only
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effective on animated WebP and has no effect on a single-frame file.
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.TP
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.I duration[,start[,end]]
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Where:
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.br
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.B duration
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is the duration for the interval in milliseconds (mandatory).
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Must be non-negative.
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.br
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.B start
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is the starting frame index of the interval (optional).
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.br
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.B end
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is the ending frame index (inclusive) of the interval (optional).
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.TP
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The three typical usages of this option are:
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.br
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.B -duration d
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set the duration to 'd' for the whole animation.
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.br
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.B -duration d,f
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set the duration of frame 'f' to 'd'.
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.br
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.B -duration d,start,end
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set the duration to 'd' for the whole [start,end] interval.
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.TP
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.P
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Note that the frames outside of the [start, end] interval will remain untouched.
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The 'end' value '0' has the special meaning 'last frame of the animation'.
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.TP
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.I Reminder:
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frame indexing starts at '1'.
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.br
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.SS FRAME_OPTIONS (\-frame)
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Create an animated WebP file from multiple (non\-animated) WebP images.
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.TP
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.I file_i +di[+xi+yi[+mi[bi]]]
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Where: 'file_i' is the i'th frame (WebP format), 'xi','yi' specify the image
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offset for this frame, 'di' is the pause duration before next frame, 'mi' is
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the dispose method for this frame (0 for NONE or 1 for BACKGROUND) and 'bi' is
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the blending method for this frame (+b for BLEND or \-b for NO_BLEND).
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Argument 'bi' can be omitted and will default to +b (BLEND).
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Also, 'mi' can be omitted if 'bi' is omitted and will default to 0 (NONE).
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Finally, if 'mi' and 'bi' are omitted then 'xi' and 'yi' can be omitted and will
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default to +0+0.
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.TP
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.BI \-loop " n
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Loop the frames n number of times. 0 indicates the frames should loop forever.
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Valid range is 0 to 65535 [Default: 0 (infinite)].
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.TP
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.BI \-bgcolor " A,R,G,B
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Background color of the canvas.
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.br
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where: 'A', 'R', 'G' and 'B' are integers in the range 0 to 255 specifying the
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Alpha, Red, Green and Blue component values respectively
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[Default: 255,255,255,255].
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.SS INPUT
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.TP
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Input file in WebP format.
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.SS OUTPUT (\-o)
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.TP
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Output file in WebP format.
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.SS Note:
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.TP
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The nature of EXIF, XMP and ICC data is not checked and is assumed to be valid.
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.SH BUGS
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Please report all bugs to the issue tracker:
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https://bugs.chromium.org/p/webp
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.br
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Patches welcome! See this page to get started:
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http://www.webmproject.org/code/contribute/submitting\-patches/
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.SH EXAMPLES
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.P
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Add ICC profile:
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.br
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webpmux \-set icc image_profile.icc in.webp \-o icc_container.webp
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.P
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Extract ICC profile:
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.br
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webpmux \-get icc icc_container.webp \-o image_profile.icc
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.P
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Strip ICC profile:
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.br
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webpmux \-strip icc icc_container.webp \-o without_icc.webp
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.P
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Add XMP metadata:
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.br
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webpmux \-set xmp image_metadata.xmp in.webp \-o xmp_container.webp
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.P
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Extract XMP metadata:
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.br
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webpmux \-get xmp xmp_container.webp \-o image_metadata.xmp
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.P
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Strip XMP metadata:
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.br
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webpmux \-strip xmp xmp_container.webp \-o without_xmp.webp
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.P
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Add EXIF metadata:
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.br
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webpmux \-set exif image_metadata.exif in.webp \-o exif_container.webp
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.P
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Extract EXIF metadata:
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.br
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webpmux \-get exif exif_container.webp \-o image_metadata.exif
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.P
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Strip EXIF metadata:
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.br
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webpmux \-strip exif exif_container.webp \-o without_exif.webp
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.P
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Create an animated WebP file from 3 (non\-animated) WebP images:
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.br
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webpmux \-frame 1.webp +100 \-frame 2.webp +100+50+50
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.br
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.RS 8
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\-frame 3.webp +100+50+50+1+b \-loop 10 \-bgcolor 255,255,255,255
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.br
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\-o anim_container.webp
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.RE
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.P
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Get the 2nd frame from an animated WebP file:
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.br
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webpmux \-get frame 2 anim_container.webp \-o frame_2.webp
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.P
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Using \-get/\-set/\-strip with input file name starting with '\-':
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.br
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webpmux \-set icc image_profile.icc \-o icc_container.webp \-\- \-\-\-in.webp
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.br
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webpmux \-get icc \-o image_profile.icc \-\- \-\-\-icc_container.webp
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.br
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webpmux \-strip icc \-o without_icc.webp \-\- \-\-\-icc_container.webp
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.SH AUTHORS
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\fBwebpmux\fP is a part of libwebp and was written by the WebP team.
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.br
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The latest source tree is available at
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https://chromium.googlesource.com/webm/libwebp
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.PP
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This manual page was written by Vikas Arora <vikaas.arora@gmail.com>,
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for the Debian project (and may be used by others).
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.SH SEE ALSO
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.BR cwebp (1),
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.BR dwebp (1),
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.BR gif2webp (1)
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.br
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Please refer to http://developers.google.com/speed/webp/ for additional
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information.
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