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gif2webp: Insert independent frames at regular intervals.

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We use the 'do not blend' option for creating independent frames.
We also mark the already independent frames as 'do not blend'.

This bounds the maximum number of frames that need to be decoded to
decode a given frame, thus leading to a much better decoding performance.

Change-Id: I7cef98af2b53751ec36993fd2bd54f7f4c4aad2b
This commit is contained in:
Urvang Joshi
2013-08-09 14:42:36 -07:00
parent ede3602e5d
commit f0d6a14b64
2 changed files with 235 additions and 43 deletions
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13
man/gif2webp.1
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@ -49,6 +49,19 @@ 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 \-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.
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.
.TP
.BI \-f " int
For lossy encoding only (specified by the \-lossy option). Specify the strength
of the deblocking filter, between 0 (no filtering) and 100 (maximum filtering).