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webpmux -duration: set default 'end' value equal to 'start'

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The options are now:
  -duration d     -> set the whole animation to duration 'd'
  -duration d,s   -> set only frame 's' to duration 'd'
  -duration d,s,e -> set only interval [s,d] to duration 'd'

+ style fix

Change-Id: I72e95282d520146f76696666f44280ad9506affa
This commit is contained in:
Pascal Massimino
2016-11-09 23:26:01 -08:00
committed by James Zern
parent f90c60d129
commit c0699515af
3 changed files with 64 additions and 29 deletions
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38
man/webpmux.1
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@ -1,5 +1,5 @@
.\" Hey, EMACS: -*- nroff -*-
.TH WEBPMUX 1 "November 8, 2016"
.TH WEBPMUX 1 "November 10, 2016"
.SH NAME
webpmux \- create animated WebP files from non\-animated WebP images, extract
frames from animated WebP images, and manage XMP/EXIF metadata and ICC profile.
@ -99,17 +99,39 @@ Strip EXIF metadata.
Strip XMP metadata.
.SS DURATION_OPTIONS (\-duration)
Amend the duration of a specific interval of frames.
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.
.TP
.I duration[,start[,end]]
Where:
'duration' is the duration for the interval (mandatory). Must be non-negative.
'start' is the starting frame index of the interval (optional). If 'start'
is less or equal to '1', its value will be set to '1'.
'end' is the ending frame index (inclusive) of the interval (optional). The
value '0' has the special meaning 'last frame of the animation'.
.br
.B duration
is the duration for the interval in milliseconds (mandatory).
Must be non-negative.
.br
.B start
is the starting frame index of the interval (optional).
.br
.B end
is the ending frame index (inclusive) of the interval (optional).
.TP
The three typical usages of this option are:
.br
.B -duration d
set the duration to 'd' for the whole animation.
.br
.B -duration d,f
set the duration of frame 'f' to 'd'.
.br
.B -duration d,start,end
set the duration to 'd' for the whole [start,end] interval.
.TP
.P
Note that the frames outside of the [start, end] interval will remain untouched.
.I Reminder: frame indexing starts at '1'.
The 'end' value '0' has the special meaning 'last frame of the animation'.
.TP
.I Reminder:
frame indexing starts at '1'.
.br
.SS FRAME_OPTIONS (\-frame)