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gif2webp: Support a 'min' and 'max' key frame interval

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Change-Id: If910c8849d7210e7227db0f45affa26fce7da102
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Urvang Joshi
2013-09-12 13:41:09 -07:00
parent 80b54e1c69
commit d538cea8c2
6 changed files with 633 additions and 256 deletions
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man/gif2webp.1
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@ -49,18 +49,36 @@ additional encoding possibilities and decide on the quality gain.
Lower value can result is faster processing time at the expense of
larger file size and lower compression quality.
.TP
.BI \-kmin " int
.TP
.BI \-kmax " int
Relevant only for animated images with large number of frames (>50).
Specify the maximum distance between consecutive key frames (independently
decodable frames) in the output image. The tool will insert some key frames into
the output image as needed so that this criteria is satisfied. A value of 0 will
turn off insertion of key frames.
Typical values are in the range 5 to 30. Default value is 9.
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.
.br
A 'kmin' value of 0 will turn off insertion of key frames.
Typical values are in the range 5 to 30. Default values are kmin = 9 and
kmax = 17.
.br
These two options are relevant only for animated images with large number of
frames (>50).
.br
When lower values are used, more frames will be converted to key frames. This
may lead to smaller number of frames required to decode a frame on average,
thereby improving the decoding performance. But this may lead to slightly bigger
file sizes.
Higher values may lead to worse decoding performance, but smaller file sizes.
.br
Some restrictions:
.br
(i) kmin < kmax,
.br
(ii) kmin >= kmax / 2 + 1 and
.br
(iii) kmax - kmin <= 30.
.br
If any of these restrictions are not met, they will be enforced automatically.
.TP
.BI \-f " int
For lossy encoding only (specified by the \-lossy option). Specify the strength